fist pumping is something that I have never really gotten into, I thought that it looked like guys showing off for no reason at all. The idea that you fist pump would be something that should stay in a film from the 70's. As it turns out I wasn't too far wrong. We are not the only species that fist pumps. Crabs have been known to fist pump also and as shocking as this may seem it is the male in the species that is known to thrust his 'fist'(claw) in the air to attract the female species. This is the thing that is going to cross my mind the next time that I see someone doing it in public. I may even try to get it to be changed so that it is now called 'the claw' I don't think that will catch on somehow.

https://www.youtube.com/watch?v=hCah3_g3Rvs