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!
Sore throats are a pain in the neck!
A traveller comes to a fork in the road, and he isn't sure which path he should take. There are two men there: one who always lies and one who always tells the truth. The traveller doesn't know which is which, and he can only ask one question to one person to find his way.
What is his question?
Add a single toothpick to form a mathematically true equality.
Move two toothpicks to form exactly four squares instead of five.