Potassium Chlorate + Gummy Bear = Violent Reaction

Molten potassium chlorate is a strong oxidizing agent that reacts violently with sugar. Gummy bears have lots of sugar in them.

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The First Taser (1935)

More punch than can be found in a boxing-glove is contained in a new electric glove invented for use by police while handling rough characters or in quelling riots. Persons contacted by an officer wearing the glove receive a 1,500-volt shock, sufficient to remove all traces of fight.

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Dry Erase Board Animation

A stop motion animation, all done on a dry erase board:

Tennis Ball Machine

This probably is not the correct way to benefit from a Tennis Ball Machine, still i think it somehow could improve your reflexes...