jew exchange
When two jewish people walk up to each other wearing their yarmulkes and put their hand on the other jews hat and put it on their head. Bassically switching yarmulkes.
We were playing basketball at the park when two guys wearing weird hats walked up to each other like they were about to do a drug deal, then they quickly switched hats and walked away without a word. The cops came up to us later asking us if we had seen a jew exchange take place.