I love how he embraces and utilizes even the silliest ideas. I can see the thought train as something like this:
Ok, I need some new material... *think, think, think...* [Stupid idea that most would discard] Hmm... wait, we can just use that as long as I make fun of myself at the end! ?
Oh, I like that! I've been using "It rhymes with orange." as a stock reply to stupid questions for a long time, but no one has ever said it doesn't before! ?