Okay, it was me. If you check out the trailer for "Hangover 2," the first thing you see is a blurb from yours truly calling "Hangover" the "'Citizen Kane' of bachelor party movies." (My link's not working but you can get it at the Hangover 2 official site).
In my defense, the blurb was a reference to the two movies' shared structure. Like "Kane," "Hangover" starts with a prologue, and the characters then backtrack to solve a mystery. What is Rosebud? Where is Doug?
Bradley Cooper described "Hangover" as "Memento" meets "Bachelor Party," and he went to Georgetown, so there.