Take a look to the first official poster of Diary of a Wimpy Kid:

(Click on the poster to enlarge it.)

DIARY OF A WIMPY KID

I’ll be famous one day, but for now I’m stuck
in middle school with a bunch of morons.

The middle school stereotypes seen in the Diary of a Wimpy kid movie are way exaggerated, but it just makes the movie even more hilarious.
:)