I don't like to drive when I have to pee. I always pee before I get in the car whether I need to or not.
TL;DR Having to pee makes you better at video games
This feels like a corollary to Cunningham's law.
"The best way to get someone to read something is to post a TL;DR that seems like it can't be right."
The effect goes away when the urge exceeded intolerable level.
Holding a shit has same effect: Defecatory urge increases cognitive control and intertemporal patience in healthy volunteers https://onlinelibrary.wiley.com/doi/10.1111/nmo.13600