It would've been a HOF-worthy self-own if he made the joke and let it lay there.
Instead he immediately clumsily crowbarred the joke in another time. Practically nudging everyone with an elbow, as if to say: "Right, guys? Right? Did you see what I did there? Because of that time when I fumbled when I was the holder on a FG that would've put my team ahead in a playoff game. 'Member? You remember that, guys? Against Seattle. The game in 2006. That's what I'm referencing. Remember that, everyone?"
His boothmate didn't give him a big enough pat on the head to acknowledge it, so he decided to just repeat it. It went from funny to sweaty.