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? 

Place the apple on one person”s head.

Related Riddles:

• Unstoppable I can kill people, but without me there would be...
• Alternating Glasses Six glasses are in a row. The first three are...
• Full Bus There is a bus full of people travelling over San...
• Indirect Murder There’s a body lying dead on a bed, and on...
• Three Rooms A murderer is condemned to death. He has to choose...
• The Wise Son An old man wanted to leave all of his money...