If you lived in the accelerated life of the Scalosians from Wink of an Eye, what kind of practical jokes would you play on the people who were normal/slower speed?
Go to Washington DC and give a wedgey to every member of Congress while they are on the floor in session. At the same time.
Go to a bank, swipe all the cash out of the sfe. Take the antidote. Deposit it. Go to a casino...tap dance on mines. Collect firearms from fools....
Mess up peoples' hair... Place flowers in children's hands... Build amazing Lego structures in peoples' living rooms... like sculptures of trees, animals, or rockets... Put episodes of TOS on everyone's TV...