Ripples
That event lives on in the Valley. A few years ago I was working in an office on a contract gig, we were all having a horrible day, so I made a tasteless (but obviously not serious, more rueful) joke about somebody snapping and shooting up the place.
One of my coworkers turned white, started trembling, and had to leave.
I found out that he'd been at ESL that day. I suppose I couldn't have known, but since then I've been a bit more careful about my "humor".