A guy walks into a bar, looking all depressed. He goes to the bar and orders a drink.

The bartender brings it to him and asks "Do you want to talk about something? You look kinda down in the dumps".

The guy says "Well, I've suspected that my wife has been cheating on me for months, so today I took the day off work to follow her. Well, when I came home, I caught her with my best friend!"

"Wow, that must have been hard!" the bartender says "What exactly do you say to your friend in a situation like that?"

The guy at the bar replies "Well, I looked him straight in the eye, and I yelled BAD DOG!"