Why do banks charge a fee on 'insufficient funds' when they already know there is not enough money?

Why doesn't Tarzan have a beard?

Why does Superman stop bullets with his chest, but ducks when you throw a revolver at him?

Whose idea was it to put an 'S' in the word 'lisp'?

If people evolved from apes,
why are there still apes?

Is there ever a day that mattresses
are not on sale?

Why do people constantly return to the refrigerator with hopes that something new to eat will have materialized?

Why do people keep running over a string a dozen times with their vacuum cleaner, then reach down, pick it up, examine it, then put it down to give the vacuum one more chance?

Why is it that whenever you attempt to catch something that's falling off the table you always manage to knock something else over?