|Picture me behind the bar, and the girl with the bag as the culprit.|
"I don't know."
Seriously? You can't give me anything? Short, tall, blond, brunette; nothing? At this point I glance around the room, gesture towards the closest server, and ask "Is that her?" More often than not it is. Occasionally I have to point out two or three people before successfully spotting the waitress who is apparently invisible to her patrons.
Please, please, don't ever be this person. I'd much rather you ask me for $7 of Patron, or even pull out a Scrabble board and start playing it on the bar.