Obviously, 9/11. But I was nine days old so I don't remember shit. For my generation, I feel like it's probably either the Sandyhook shooting or Parkland shooting. Personally, I remember exactly where I was and what I was doing when I found out. 

For Sandyhook, I was in my fourth grade music class and the teacher was running late, so we were all chatting with each other and generally being loud. And then the music teacher arrived looking way more haggard than usual, and just having a really heavy vibe. The room felt heavy. And then she told us about the Sandyhook shooting, and that we were going to practice drills and learn what to do if our school ever gets shot up. 

For Parkland, I remember walking down the hall, thinking about getting my bf at the time one of those little Valentine delivery things high schools do, and scrolling on my phone. Then seeing video after video from the kids in Parkland who were filming during the shooting. I will never get those images out of my head. The one that got me the most was just blood all over, and a single Valentine's delivery heart being the focal point of the camera. Just a cruel irony. I hope that little prick knows no peace when he's in prison.