Old joke (ethnicity removed to protect the poster): God comes to person X and tells him/her that God will give them whatever he/she wants. But God cautions them that God will gives their neighbor twice as much. The person thinks a bit and says, “Pluck out one of my eyes.”

Other example: merging traffic in Austin, Texas and Northern California, USA. In Austin, drivers will try to intimidate each other to get ahead; the traffic slows a lot at each Y intersection. In Northern California, drivers alternate and the traffic hardly slows, AKA the zipper.