Acting on a tip off, the police raid a flat to arrest a suspected murderer. They dont know what he looks like but they know his name and that he is inside the flat. The police burst in and discover a bricklayer, a taxi driver, an electrician and a fireman plying cards. Without any hesitation or communication, they arrest the fireman.
How do they know they've got the suspected murderer??
Well, done folks, he fell off the bottom rung. I can see I will have to give you all something harder next time. I think the answer to the months of the year riddle is the letter U?