Thumb Wrestling
You can play this any time there's a conflict or difference of opinion—real or imagined.
Start spontaneously.
"Let’s have a thumb war," and hold out your hand. Then, defeat her mercilessly.
Variations:
"You can tell a lot about a person by how they thumb wrestle."
Segue into cold reading.
Launch into a cheeky story about becoming your school’s thumb wrestling champion, and how to this day, there’s a commemorative plaque with your picture hanging on the wall.