A man walks into a bar with a 3 gallon bucket... He asks the bartender if he could fill it up with beer. The bartender says ""sure"" and fills it up. The guy pays for it and leaves. 20 minutes later the guy comes back with the same bucket and asks the bartender if he'll fill it up again. The bartender says ""sure but if you don't mind me asking what are you doing with all this beer?"" The guy says ""well it's a really hot day and I wanted to give my mule a treat."" The bartender says ""you know that's a real humane thing to do. Just for that you can have a drink on the house."" The guy says ""no thanks. I never drink and drive.""