Practical jokes

Whether for a class demonstration, a practical joke, or perhaps a clandestine activity, disappearing ink is a fascinating substance. What is the secret to its action One formulation of disappearing ink contains a common acid-base indicator, that is, a substance that by its color shows the acid or basic nature of a solution. One acid-base indicator that shifts from a colorless hue under acidic conditions to a deep blue color in alkaline solutions is thymolphthalein. If the indicator starts off in a basic solution, perhaps containing sodium hydroxide, the typical blue color of an ink is perceived. How does the ink color disappear This behavior is dependent upon the contact of the ink with air. Over time, carbon dioxide in the air combines with the sodium hydroxide in the ink solution to form a less basic substance, sodium carbonate. The carbon dioxide also combines with water in the ink to form carbonic acid. The indicator solution responds to the production of acid and returns to its colorless acid form. A white residue (sodium carbonate) remains as the ink dries. 

A laboratory is never a place for practical jokes or pranks. 

There were so many practical jokes and so much cheerful mischief that the Master (Mark) on his 80th birthday asked himself, How is it that in spite of it all, something worthwhile came out of it. "... 

Mark is also known for his love of the practical joke. Clearly he has taken advantage of his respected experience and sunny disposition, for the merriment of (almost) all. Otto Kratky tells of the time in Dahlem when a quartz vacuum pump used for evacuating X-ray tubes ceased to function. After failing to find the reason, Kratky took the problem to Mark. 

Disciplinary action may be appropriate if malicious or criminal intent is positively identified as a root cause. An example would be when an investigation reveals horseplay, practical jokes, fights, or even sabotage was among the root causes. These activities have no place in any workplace and are especially undesirable in the chemical processing industry. It is most likely that a company s employee handbook, human resources documents, or union contract addresses these situations and communicates the policy in advance of an incident. In short, the investi-... 

As Rosenkreutz wryly observes with a certain measure of sangfroid, we had all been thoroughly foxed... and we had to be reconciled with the Virgin s practical joke. Immediately following this sexual practical joke, chance pairs us, the frustrated Bachelors must witness a play within in a play, and. 

At my urgent request the Curie laboratory, in which radium was discovered a short time ago, was shown to me. The Curies themselves were traveling. It was a cross between a horse-stable and a potato-cellar, and, if I had not seen the worktable with the chemical apparatus, I would have thought it a practical joke (10). 

The volume of a whoopee cushion is 0.450 L at 27.0°C and 105 kPa. Danny has placed one such practical joke device on the chair of his unsuspecting Aunt Bertha. Unbeknownst to Danny, this pcirticular whoopee cushion suffers from a construction defect that sometimes blocks normal out-gassing and ruins the flatulence effect. So even when the cushion receives the full force of Aunt Bertha s ample behind, the blockc e prevents deflation. The cushion sustains the pressure exerted by Bertha so that the internal pressure becomes 200 kPa. As she sits on the cushion, Bertha warms its contents a full 10.0°C. At last, and to Danny s profound satisfaction, the cushion explodes. What volume of air does it expel ... 

Silver fulminate is still used for similar purposes in practical jokes, in toy torpedoes (see Vol. I, p. 106), and in the snaps or pull-crackers which supply the noise for bon-boms, joy-boms, and similar favors. 

Except in an emergency, running, or any over-hurried activity, should be forbidden in and around the laboratories, as should be practical jokes or other irresponsible behaviour. Eating, drinking and smoking in the laboratory should also be forbidden these constitute a further, avoidable, risk of the ingestion of toxic substances, and in the case of smoking an obvious fire hazard. 

Although largely a scientific curiosity, contact explosive is well suited for practical jokes. It can be painted or sprinkled on light switches, floors, keyholes, pencil sharpeners, doorknobs, and in hundreds of other places. It is also ideal for catching locker thieves and desk prowlers, since the noise from the explosion will attract immediate attention and the explosive will leave a dark stain on the intruder s hands when it explodes. 

Avoid distracting or startling any other worker. Practical jokes or horseplay cannot be tolerated in the laboratory. 

Those Militants not content to psych out the driver with some practical joke have his last ride in mind. 

Proper behavior is expected in the lab. Practical jokes and fooling around can lead to accidents and injury. 

I would also be seriously remiss (and subject to numerous and humiliating practical jokes) if I failed to thank my diligent proofreaders, Dr. Jill Trendel, Crystal Bykowski, and Michael Reese, whose assistance has been invaluable in completing this chapter. 

Ricin tips are for an enemy you want to knock off without a stir. He ll probably think he s just the butt of a nasty practical joke. Unless he called attention to his di, bystanders wouldn t react. 

One military trainer in improvised weaponry told me of a case where someone forced ANTI into a lock When the victim put his key Into the lock, the ANTI exploded with such force that it drove the key through his hand. So don t consider ANTI as something just for practical jokes. Although it does lend itself to practical jokes, it is a high explosive So either save it for the Russians or or use it in tiny bits. 

Irresponsible behaviour (or practical jokes) must not be allowed while working in a chemical laboratory so as to maintain both santity and a congeneal atmosphere amongst the colleagues of either sex. 

The filmmakers take advantage of a "US Olympic media summit" (a press conference) to add a bit more exposition about the Athens Paralympics, and Mark Zupan describes his visit to the rehab hospital and how "fulfilling" it was to see the response of one patient (Keith). The inclusion of this moment is nice, in part because it tells us that the sequencing of these events is real. From there, the film moves on to 1 Month to Paralympics (65 14). The filmmakers add some breathing room here, as the team plays a practical joke they also erase what... 

The hazardous practice of using the reactions of the alkali metals with water to perform a practical joke has been described by H. Allen Smith.Henley mentions a magic trick whereby drinking water... 

Serious injury and even death have resulted from horseplay, practical jokes or silly tricks. There is no place for this type of behaviour in the workplace. 

Anyone indulging in horseplay or practical jokes within a laboratory should be excluded from the facility. 

In the area of workplace harassment or the prevention of a hostile work environment, safety professionals should be aware that what may be considered to be horseplay by some may be considered workplace harassment to others. The harassment is viewed through the eyes of the employee being harassed. Although most safety professionals do not permit any type of horseplay in their operations, it is important for safety professionals to be aware of other activities, such as name calling, practical jokes, and other similar activities that may also create a hostile work environment for an individual employee who is protected under the ADEA as well as other federal antidiscrimination laws. 

Horseplay Avoid practical jokes or other behavior which might confuse, startle or distract another worker (23). Mouth suction Do not use mouth suction for pipeting or starting a siphon (23, 32). 

There should be no boisterous conduct, excessive noise (radios, DVD players, iPods), or practical jokes in the laboratory. 

Indulging in practical jokes, fighting, sleeping, creating distractions, etc. 

Serious injury and even death have resulted from horseplay, practical jokes or silly tricks. 

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