So I Heard This Funny Joke

I can't take credit for this one, but it's too good not to share. And, to get technical, I didn't hear it but rather saw it on Teh Internetz.

Q: What's the difference between Rush Limbaugh and the Hindenburg?
A: One is a flaming Nazi gasbag; the other is a magnificent German airship.

For direct comparison:

That's Limbaugh in the top photo, positively radiating intelligence as always.