It happens when you are intoxicated and leave the bar to hook up with an ugly girl at her place. Upon the sobering drive to her place you realize she is ugly and don't want to have sex with her anymore. When she goes to the bathroom to "freshen up" you pull back the comforter on her bed and take a shit, then tuck it back in. When she comes out you pull back the covers, act surprised and call her a sick person, then run away.
Dude, I almost did that ugly girl that I was talking to last night. When I got to her place I realized the trouble I was in and pulled a Cincinnati Turndown when she was in the bathroom.