Ramsobot, it may just work. A few years ago a friend of mine and his brother went to a benefit for McSweeney's and S. Vowel was offering shoulder punches to people if they made a small donation. Basically, you would go up, pay your fee and Sarah would give you a nice little punch in the shoulder, a kind of, "nice job, pal" kind of thing. This got my friend's brother to thinking. He turned to my friend and said, "I wonder if I can get a 'Donkey Punch' from her instead". My friend turned beet red (because he knew he wasn't joking) as his brother went up to stand in line to see if he could get his special request. When it was his turn, my friend said that he could see his brother say something to Sarah, who then shrugged her shoulders as if to say, "why not?". His brother leaned over and Sarah tapped him in the back of his head with her fist. He said thank you and left and she went on to the next donor.
True story. Good luck, Ramsobot!