Check out George Carlin, lately passed. Apparently he was gifted and of course hysterically funny, if you go for that sort of thing. Dropped out of high school, his entire family were dictionary-ophiles, had an obsession with words and word sounds/combinations from a young age, etc., etc.
(hope this is the right interview...)
http://www.npr.org/templates/story/story.php?storyId=4136881

My dd2 is pretty funny and enjoys making a good joke, she is routinely mixing up her colors and I thought she just didn't know them, but when I ask her to get her red socks, she goes right for them (or whatever color). She just enjoys making me laugh when she calls every color 'green' - you can see her looking at you very expectantly waiting for you to laugh..
She will sneek up on your drink or sandwich and make as if to steal it, hand poised, eyes shifty, waiting for you to notice her treachery and then runs off laughing. It's too fun. Can't wait for more.