Three roomates go out on separate dates. Coincidentally, they all come home at the same time, sans date.
The first one said, "You know you've had a good date when your hair is messed up."
The second one says, "You know you've had a good date when your makeup is smeared."
The third one didn't say anything, but instead reached under her skirt, removed her panties, and threw them against the wall, splat, where they stayed, stuck to the wall.