I get what you're saying, but while the details might be different (e.g drinking age 21, not 18, the whole graduation thing), they're still generally similar experiences that people can relate to here. I remember being 16 and the discussions over who should be the one to go to the off licence, people with rubbish fake ID, and the universal hormonal teenage male need to get laid as soon as possible whilst making no progress whatsoever. In other worRAB, you could tweak a few things, lose the guns, and make the same film here.
Knocked Up is much more of an American experience.