Answer:
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
A man was sitting on his couch and searching for the English Channel. How did he find it?
How far can a man hike into the forest?
What is yours but only used by others?
Twelve pears hanging high, twelve men passing by. Each took a pear and left eleven hanging there. How can this be?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.