Well there were a couple suicides, underage pregnancies, one of my classmates having sex with a teacher (F 16, M40+), a teacher who got shot on a bus, and another teacher who died suddenly in a car crash because he was recklessly driving with a sex worker.
But none of that transcended as "the incident". Personally what was most memorable to me was the time a large gasoline truck crashed and tipped over right at the gates of the school. It didn't catch fire but it got messy fast. Class got cancelled, the street ( a busy avenue) got cut so they could spray some substance on the spill. Fun times hey.