Here’s a fun game: take your favorite person and your least favorite person, and give them a questionnaire to see how compatible they are. That’s basically what David Letterman did with Bill O’Reilly. Compatible for what? you ask? I have no idea. Friendship? Life? Grindr matches? Whatever it is, these two are out of luck. Because you can disagree on baseball vs. football and chocolate vs. vanilla, but pie vs. cake is an insurmountable matchmaking discrepancy. It just wasn’t meant to be.