Riddle: What did the barman say when the ghost asked for a drink?

Sorry, we don't serve spirits.

serve (verb):
1) perform duties for someone (Have you served that customer?)
2) present or sell food or drink (I hope they serve wine here.)

spirit (noun):
1) (usually plural, spirits) strong alcoholic drink like whiskey or rum
2) a supernatural being; a ghost

barman (noun): a man who works behind the bar of a pub or hotel etc
ghost (noun): a supernatural being; the hazy appearance of a dead person; a spirit

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