When Tanner was in high school, he came home from school one evening and invited Jason to a reverse arm wrestle competition.
In reverse arm wrestling, one person sits with their elbow on the table and makes a fist with their fingers toward their face. the other person grabs the fist with one or both hands. The object is for the first person to pull the second person's arm off the table. Meanwhile, the second person is supposed to pull the other person's wrist to the table.
This embedded video demonstrates the reverse arm wrestle technique.
Jason had never heard of a reverse arm wrestle. He enthusiastically agreed to participate with Tanner. They both got set. I called "Ready, Go!" Jason started pulling Tanner toward him. Tanner gave a big surge to stop Jason's pull and started moving Jason's wrist toward the table. Then, Tanner released his hold. Jason punched himself in the face so hard.
I am not sure if Jason ever forgave Tanner for that prank!