Haha, that reminds me of whenever one of my friends and I used to come across a door. We'd both hold it open and say "you first, I insist" and stand there. One time, I believe it went on for a solid 20 minutes.

(Other... "unusual" behaviors include standing in the pouring rain for an entire hour till the other gives up, passing the party leadership onto each other for a solid 10 minutes until one of us starts the game queue...)