Oh jeez, I'm dyin' here.
Thanks to
this "Know Your Meme" video (also responsible for my previous link), I've followed their links to some of the reaction videos for "2 girls, 1 cup". Which, judging by the reactions and tags for the reactions, I'm not sure I can actually stand to watch. But knowing what it involves, makes these reaction videos freaking hilarious:
http://www.youtube.com/watch?v=Q-9_OZ_2b54
http://www.youtube.com/watch?v=_SsUTLAhbWE
http://www.youtube.com/watch?v=nOn1htjSZic <--NSFW
http://www.youtube.com/watch?v=x4H9BzJAyY4 <--NSFW
Actually just consider all of them NSFW, just to be on the safe side. (language)