Years ago, when projectors were common in conference rooms. Someone was giving a practice presentation before the real deal in front of 80+ audience members. It was just our team of 8 or so the room for the dry run. In the middle of the presentation, there was a terrifyingly loud POP sound as the bulb blew out in the projector. It scared the shit out of everyone in the room. We all laughed after the initial shock wore off.

One of my coworkers stepped up on a table to take a look at it. I was near him and I waited for silence in the room while he was fucking with the thing, and clapped my hands together very loudly, simulating the previous scare. He let out a shriek of terror and clutched his chest. Everyone laughed. Eventually he laughed as well, but said something like "damn, that scared me." Within a week he had a legit heart attack.

He was ultimately okay, but I still think about it. I know I didn't cause it, but for a long time I couldn't shake the guilty feeling that I contributed to it. Oops. Sorry Ken.