"I am going to be boiled in water."

I read a different version of this once, and I LOVED it.
You see, if he says that, and they think it's true, they'll have to fry him. But that would make it false, and so on and so on.

My head hurts, so this is all I can think of:
Q. Where did the (insulting) term "Dumb Blonde" originate?