Funny Riddles

Question: When you do not know what I am, then I am something. But when you know what I am, then I am nothing. What am I?

Question: You are awoken at 3 A.M. by a knock on your door. Your parents call you to let you know that they are there for breakfast. You are confused but quickly think of what food you have. You have bread, jam, butter, and eggs. What do you open first?

Question: What is the coolest letter in the alphabet?

Question: What chair can move

Question: What does a man do only once in his lifetime, but women do once a year after they are 29?