I know we're so open minded here but why would a man do this?

A grown man, a friend of friends whom I’ve never met, had a happy face, in yellow, permanently tattooed on his forehead. They say when you’re talking to him you find yourself staring at the happy face as much as at his real face. Why do you think someone would do this? You’d have to have awfully thick bangs to cover it up in , say, fifteen years.