can’t remember where I read this, but I like this type of humor.  What do you call it?  Pun?

It’s hard to explain things to kleptomaniacs, they take things literally.

(should this have a comma after “things”, so that people pause when reading it, as it would be said)?

These next ones are from FOCM Member Andrew Smith:

Do you know why a koala isn’t considered a real bear?
They don’t have the koalafications.

Did you hear about the guy whose whole left side was cut off?
He’s all right now.

I wasn’t originally going to get a brain transplant, but then I changed my mind.

I’d tell you a chemistry joke but I know I wouldn’t get a reaction.

I wondered why the baseball was getting bigger. Then it hit me.

Yesterday I accidentally swallowed some food coloring. The doctor says I’m OK, but I feel like I’ve dyed a little inside.

I’m reading a book about anti-gravity. It’s impossible to put down.