Good Riddles

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

What is it?

Question: Samuel was out for a walk and it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet.

How could this be?

Question: What's always coming, but never arrives?

Question: Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Question: what house can fly?