Obnoxious Kid on poker night

This guy is having a lovely poker game at home until his obnoxious 12-year-old son started disrupting things by going around, telling player's cards, making noise, and being a general nuisance. The father is about to discipline him when an uncle of the family says, "Let me handle this."
The uncle takes the boy in another room and much to everyone's surprise, they don't see him the rest of the night. The father says to the uncle, "I really appreciate what you did, what did you say to him?"
The uncle says, "I really didn't say anything, I just showed him how to masturbate."