A man walks into a bar, looking very depressed. He goes to the bar and orders a drink. The barman brings it to him and asks:
"Do you want to talk about it? You look a bit down in the dumps".
The man says, "Well, I've suspected for months that my wife has been cheating on me, so today I took the day off work to follow her and when I came home, I caught her with my best friend!"
"Wow, that must have been difficult!" the barman says, "What exactly do you say to your best friend in a situation like that?"
"Well, I looked him straight in the eye, and I yelled BAD DOG!"