I just remember when I went to see Casino Royale with my family ages ago, and there was this massive group of chavs that came in, and they are just the kind of people you expect to cause trouble.
The big problem was that there were like 30 of them, and throughout the movie they were talking loudly, making stupid comments about the film etc. and when another member of the audience confronted them, they just insulted him back, and it was worse when the staff came in, because they could not boot out of all of them, so they just chucked out a few and it quieted down, but it still ruined like half the movie... so damm annoying
More OT, if you want to see stereotypes, just watch South Park, it is a world where every stereotype is true, the black people have base guitars in their basement, the Jew are very precious with their money etc... it is even better than Scrubs with stereotypes