Funny Riddles

Question: What goes in, down and out; but can't go in, up, out?

Question: You see me roll everday.

Question: A blue man lives in a blue house. A green man lives in a green house. Who lives in the white house?

Question: Which is correct "The yolk of the egg is white" or "The egg yolk is white?"

Question: What is the longest word in the dictionary?