Saw Superbad twice so far. I'd see it again too. No comedy has had this much rewatchability (word?) since 40 Year Old Virgin. And whaddya know? They were done by the same dude. Judd Apatow, the man who also brought us Fox's Undeclared and the summer's other hit comedy Knocked Up.
What sets Superbad apart is how it succeeds on so many levels: Dialogue, casting, soundtrack, relatablity; everybody sees a little of themselves from high school in this movie (well every dude... ok, at least every suburban dude).
For better or worse, the rest of the country feels the same (number one movie for 2 weeks), so I'd suggest checking it out before it approaches "If I hear one more f*cking quote from that damn movie" status.
Check out this practical joke interview. It's moderately entertaining. Ok, its dumb but I'm being lazy: