Good Riddles

Question: The King and A Butler walk into a room, they lock all the doors behind them, the room has no windows. A night passes and the next day 3 people walk out of the room, Who is the 3rd person?

Question: I have existed for centuries, but last only a month. What am I?

Question: Why can't the Tyrannosaurus rex clap?

Question: How many letters are in the alphabet?

Question: What is the best way to keep your hat from falling off your head?