The Hangover. I didn't laugh once, & the amount of times I heard it praised/referenced in high school totally led me to believe it was one of the greatest comedies ever. Maybe it's not my type of humor, but I was like, welp....
Bridesmaid is 100x funnier but doesn't get nearly the amount of recognition. But that's because Kristen Snatch-Yo-Wiig >>> (is that a nickname? Oh well, I had to

)