End of High School Rituals

I basically celebrated ending high school by sending off my upgraded summer school marks so I could get into university.

I skipped the graduation ceremony because it was sometime in November and I had better things to do that weekend with my limited time and esp. money.

Since then I have noticed that this minimalist approach is not at all common and that many people take part in elaborate ceremonies involving limos, gowns and ritual deflowerings ala "American Pie."

So my question is how did you mark the end of high school?