Pat social

Social pat: pat a head, or slap your own forehead in revelation

Here is how this social looks to you and to everyone around...

On yourself: You pat yourself on the head -- Eureka! Kadm pats himself on the head -- Eureka!

No argument: Pat who?

On someone: You pat Yuteka on the head. Kadm pats you on the head. Kadm pats Yuteka on the head.