First you pour diet coke in a girls vagina. Then you grab a handful of mentos and fist fuck her for a count of three. Do not count to four, nor two, lest it proceedeth you to three. Five is right out. Then get the hell out of the way.
"The other day I was fisting my girl and she said 'hey, let's try something kinky' so I gave her the Holy Hand Grenade. I was cleaning diet coke off of my walls for three days.