I agree he's a goofball/weirdo, but I found that joke to be kind of funny. Somebody doesn't need to bust into a "comedic tone" to make a joke funny, it was dry humor, which I happen to enjoy. Bob Newhart, for example, delivered every joke in a dry tone. Or some more recent examples would be comedians like Todd Barry and Anthony Jeselnik, both of whom are very popular comedians who do their whole set completely monotone. It's a style of comedy some people like and others don't. I'm not saying Brad is a funny guy, at least not intentionally (most of us laugh at him more than with him), I thought that bit was kind of humorous though.
"IF THE DEVIL HAD A NAME, IT WOULD BE CHUCK FINLEY!!"
Spot on, Admiral!
While Brad is not a great orator, his deadpan delivery of humor among dry information, is one of my favorite things. Like with the OP's example, I laughed so hard because Brad was clearly being self-depicating. He injects those one-liners in his presentations just to lighten the mood, to be fun.
I laugh at, and with, Brad...and I enjoy his uniqueness. He's not some pretty boy that thinks he's "all that"; he's an intelligent geek that proudly wears his excitement for history and mystery.
Oh, and he's a good writer.
"Don't get chumpatized!" - The King of Kong: A Fistful of Quarters (2007)