@sadoperator
Back in high school, at one of the computer labs, I created a Powerpoint that looked like a DOS session where someone had deleted C:\WINDOWS. I made it two pages of the same text, with the second page having an underscore at the end of the prompt, and then started the slideshow with automatic slides, so it looked like the cursor was blinking.

A teacher saw it and thought that I broke the computer and reported me, even when I showed all they had to do was hit Escape. My punishment ended up being two weeks of hanging out with the school IT guy for half of my lunch period as he went around and fixed broken computers.

When I told him (and showed him) what I did, he thought it was hilarious. We became good buddies.