At a pub a few months ago ( there is a thread here about this crazy night here somewhere) a bachelorette party came in at about 12:30...

they saw me in my kilt, and the maid-of-honor walks up and tells me "We have been to a lot of bars tonight, and you are the sexiest guy we have seen! Do you have a girlfriend?"

that pretty much would be the best one I've heard so far.