Resetting the bar

Radio DJ: That was a concerto by Wolfgang Amadeus Mozart. He wrote this particular piece when he was just 18.

Me: Nicely done, Herr Mozart.

Radio DJ: He'd written two concerti before that. Isn't that surprising?

Me: What, that Mozart was an overachiever? Yeah, shocker.

Radio DJ: You would have thought that he'd have written a lot more by then. But no, only two.

Me: You make a good point. What a slackass!