Fun Riddles

Question: You can only keep it once you give it to somebody.

What is it?

Question: In Michigan you cannot take a picture of a man in a green hat.

Why?

Question: I take what you receive and surrender it all by waving my flag.What am I?

Question: If you look at my face there won't be 13 any place.

Question: John put a coin in a bottle and put a cork on the bottle and later managed to get the coin out without taking out the cork or breaking the bottle. How did he do it?