A blonde, a brunette and a redhead were waiting for an elevator.

On the floor, next to the elevator door, was a tiny puddle of milky liquid. The brunette notices it first and says, "Oh my God, that looks like semen." The redhead bends down and sniffs, "Oh my god, this smells like semen." The blonde gets down on one knee, dips her finger in it, and sticks the finger in her mouth to taste it and blurts out, "It's not anybody from our building."