Something fun to do

Go into a gas station, buy some items, and when you get to the counter ask the employee if he has a small sack. Try not to giggle. If he says yes and then puts his hands in his pockets and glances sadly down toward his crotchal area, the joke has failed.
(Side-note: One day in high school yearbook class, we spent an entire class period calling bowling alleys and asking the people who answered if they had 7 pound balls. Some things will always be fun....)