I still laugh my butt off when I see dumb and dumber. That is one of my favorite comedies. Now the second one was total crap for sure.
As to Accepted, my wife set up two friends for a blind date, so we got dragged into taggin along to assure the girl that the guy wasn't a serial killer.

She picked the movie...NOT me. Note, never let your friends pick the movies you see at regular price, else you'll end up paying $16 to see Accepted, or even worse, Van Helsing.

I saw the rottentomatoes ratings, but I still think this is a rental at best.
And since we are on the comedy subject, Hot Fuzz was hilarious. Of course, I loved Shaun of the Dead so I figured this one would be good. The less you know about the plot of Hot Fuzz going in, the better it is. Remember that!
