Clemson has been doing this for several years and I am new so I don't know if it has ever been discussed...

Clemson's football players are given chips before each game and before they enter the stadium they give their chips to a coach so that they are "all in" before the game. Coach Swinney started this tradition when he was the interim head coach in 2008.

https://instagram.com/p/RYHbTDxt5T/