I've seen 2 such videos.
The funniest one starts with a girl going on and on about womens rights for a good minute or so. Then some guy with a 10-incher appears and force feeds her until shes gaging and drooling all over herself.
The second is basically the same deal, but it's a porn chick talking about how hard she works, followed by a good throat reaming.
I'm pretty sure you can get 'em off Kazzaa, although I'm not sure of the file names, sorry. You could also try stileproject.com or rotten.com