I put it back

I put it back

A guy goes back to his college dorm with two black eyes. When he enters, his roommate asks him,

"What happened to you man?"

"I had trouble with a girl on the escalator"

"What'd she do?"

"She was in front of me on my way up and I noticed her skirt was stuck in between her butt cheeks so I pulled it off by the edge. Then she turned around and punched me."

"... okay. So how'd you get the other black eye?"

"Well, I thought she didn't want her skirt that way so I put it back."