Because being chased by ghosts is way too hard.
Every 108 minutes, the button must be pushed.
Don't hit the walls, or you'll sink!
Did you hear about the scientist who was lab partners with a pot of boiling water? He had a very esteemed colleague.
You're driving a bus on a very busy route, with 17 passengers. At the first stop, 3 passengers get off the bus. At the second stop, 5 passengers get on. At the third stop, 6 more passengers get on. Finally, 10 passengers get off at the last stop.
What is the name of the bus driver?
Add a single toothpick to form a mathematically true equality.
Move two toothpicks to form exactly four squares instead of five.