That one person you watch with who knows the balk rules: Nelson Cruz?!?!?!?!? (.205 WPA)
Literally everybody else that you’ve ever watched baseball with who has no clue what does or doesn’t constitute a balk: Edwin Díaz (-.207 WPA)
The person who has to go to work on Monday and fix how Fangraphs assigns WPA in the case of a walk-off balk: Kyle Seager (0.133++ WPA)