Psychic Midget

Alright, listen up, you big ol' dummy. This one's a pun, see? You, being the person who asked for this, probably have trouble tying your shoes. A 'psychic midget' is a short person who can see the future. 'In trouble with the law' means they're wanted, like a criminal. Now, the punchline, 'a small medium at large,' has two meanings. 'Small medium' refers to the midget's size and their psychic ability (a 'medium' is someone who talks to spirits). 'At large' means they're not caught yet, but it also sounds like 'a large' for a small person. Get it? You probably still don't, you big silly bear.