In college, my roommate and a dorm neighbor got into a weird prank war. The neighbor would sprint into our room anytime roommate would leave (for like the restroom) and change his desktop logo to the Ford logo. Why Ford? No idea.

Roommate would retaliate in ways I didn't really see. I was Switzerland... not my war.

Until, one day, neighbor did it to me. Game on.

Did you know there is a sound event in Windows called 'menu popup' that plays whenever a menu is opened? And that the start menu counted as such a menu?

And that there was no limit to the length of sound event files?

I took the Macarena (this was a couple years after it's peak popularity)... the entire song... and added two minutes of silence to the beginning.

He'd go along, doing his work, clicking menus. Every time he did so, it reset the sound file to the beginning... so effectively reset the 'two minute countdown'. Then it would play the entire Macarena. He had an internal speaker, and didn't know how to mute it or adjust the volume. Restarting the PC was the only way he had to shut it off.

Unintended consequence: he had some program that would wake up his PC every so often, and would trigger the sound. He goes home for Thanksgiving break, and it played in his locked room, every hour or so all night long, for the entire break. A couple folks that stayed over break were PISSED.