Rush Limbaugh keeps mocking Obama for being too much of a professor.

And I agree with a lot of this mockery. So don't get me wrong: I like Rush Limbaugh. I listen all the time. But that means I catch some things that you may not notice. And I caught a couple of ironies in yesterday's show.

First, he's twice played this clip from the Rodney Dangerfield movie "Back to School":



And yesterday he says that it shows "an economics course with an Obama type professor, an arrogant, conceited snob who has no understanding of what really happens in the business world... who thinks he has all the answers."

So Obama doesn't know what goes on in the real world, and the evidence of what goes on in the real world is... a Hollywood movie. Irony #1.

Later, after this putdown of professors, he's talking with a caller about the subject of "the Big Lie" (a concept from Hitler's "Mein Kampf"):

RUSH: Well, see that's the nature of the Big Lie. You tell something --

CALLER: You're right.

RUSH: -- so audacious that nobody could possibly think they'd make it up.

CALLER: No. No. Well, Hitler used to do that. Goebbels was great for that, just tell a bigger lie and bigger lie --

RUSH: Hitler didn't need Goebbels. Hitler was the architect of all this stuff. Goebbels, he just implemented it all. He didn't need Bormann. He might have needed Rommel --

CALLER: -- started it all (crosstalk)

RUSH: -- and he might have needed Christoph Waltz, and Hitler might have needed Bormann.

CALLER: Yeah, that's right.

RUSH: But Goebbels made movies out there....

Rush and the caller are suddenly acting like a couple of know-it-all history professors. What the hell does Rush know about who Hitler needed? Irony #2.