Rose(: > Status Update

A guy walks up to the bar, he asks the bartender for a glass of water. The bartender pulls out a shot gun and shoots, barely missing the man. The man says thank you, leaves a tip on the counter and leaves. Why did he say thank you and why did he leave a tip? If you already know the answer to this then laugh and like this status. If you don't then leave guesses on comment. :)