A brunette, a redhead, and a blonde walked in and ordered a drink.
The redhead walked in and asked the bartender "Can I have an RW?"
The bartender asked "What the hell is an RW?" she replied "Red Wine, DUH."
Then the brunette walked in and ordered a WW.
The bartender asked what that was and she replied "DUH White Wine."
Then the blonde walked in and ordered a "15" .
The bartender said "I give up. what's that?" She replied, "Duh a 7 and 7!"