Riddle of the Day

[Gizmokid2005]

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way other than the eyes. Where can you place an apple so that all but one person can see it?

ANSWER (Congrats Mathster): Put the apple on one person's head.

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NEXT RIDDLE (better get this one, it's an oldie):

You are standing in front of a room with one lightbulb inside of it. You cannot see if it is on or off. Outside the room there are 3 switches in the off positions. You may flip the switches any way you want to. You stop flipping the switches, enter the room and know which switch controls the lightbulb. How?