Originally Posted by Efrem

Not quite that simple. If you stand a round for your table at a U.K. pub, it's common to tell the bartender "have half a pint on me." A 'tender who actually drank all those half pints would be totally sloshed before the evening was half over, but the price will be added to your tab as a tip - while avoiding the messy, somewhat degrading, bit of asking for money.