The girl is on her back with her legs on top of the man's shoulders. As he cums, he throws sand (or any other fine granule...such as ground coffee) into her eyes. When she finally rubs it away, he is gone. Only then will she know the wrath of the angry ninja!
Matt: I met this bitch in a bar last night and we went back to her place to fuck.
Joe: What happened?
Matt: In the middle of it, she asked what I was doin' tommorrow!
Joe: What'd you do?
Matt: I blew my load my load on her face and gave her the angry ninja!