Dating two girls in a row that were clinically depressed (and apparently good at hiding it at the onset of the relationship), and then having the second one try to kill herself after the break-up.
Back when I was 17, a bunch of friends mine and I went driving around with plastic guns that fired spring-loaded plastic BBs. We came across a bunch of my little brother's friends (who were about 12-13 yrs old), and I shot one of them. This is the sort of gun that if you shoot yourself point-blank while naked, it won't hurt or leave a mark.
Anyway, apparently some 3 year old saw me do it, went to his mother and said "Somebody shot Adam!" You can imagine what happened next. Eventually my Dad gets a phone call the next day, starts screaming obscenities at me, and we run down to the kid's house and I basically "turn myself in," so to speak. The dad says, "oh, if I'd have known it was him, I wouldn't have even called the cops. I'd like to drop the charges." For some fucking reason, they couldn't, I had to go give a statement and investigated for the next month, and then finally they asked me "Was this act malicious," to which I replied, "NO! Are you fucking serious?!?!" While I never really got punished, it was the most nerve-racking month of my life cause I thought I was going to get kicked out of the country (Korea - we lived on base) for something so damn retarded.
tl;dr - shot kid with plastic spring-loaded bb gun, gets blown out of proportion, nothing happens in the end, just fucking nerve-racking.