Fun Riddles

Question: A Florida man is running down a hall with a piece of paper. The lights flicker and he falls to the ground in tears.

What happened?

Question: What occurs once in a minute, twice in a moment and never in one thousand years?

Question: What is something that you always have with you but you always leave behind?

Question:

The dirtier I am, the whiter I get,
Leave a mark on me when you stand, I'll leave a mark on you when you sit.

What am I?

Question: Why can't the Tyrannosaurus rex clap?