Elevator Scene

A redhead, a brunette, and a blonde are riding in an elevator. The redhead notices a spot on the elevator wall and says, "That looks like a cum stain!"
The brunette leans over and smells the stain. "Smells like a cum stain too!"

The blonde leans over and licks the spot on the elevator wall, then says, "Yep, but it's nobody from this building."