A Blonde, a Brunette and a Redhead are all in an office elevator when the brunette spots a white blob on the floor.
"Ewww, that looks like semen!" she squeals.
The redhead kneels down and sniffs it, "Yep, it smells like semen too!"
The blond dips her finger in it, sucks the finger and say, "Well, it's no one in OUR office."