As a student in the mid 90s, we were among the first students in the Uni to use the Web. The PCs we had at the time were basic business PCs, with no niceties such as sound. So, when I got access to a lab with Sun Sparcstations that did have onboard sound, good graphics and full web access, I started exploring..
One day, in a lecture where we actually trying to learn to code for X Windows in C, I'd completed my exercise, and started looking on the web while I waited the other students to catch up. I clicked on an innocent looking link. 30 seconds or so later, Nirvana's Smells Like Teen Spirit blared out, earning me weird looks from my fellow students and a stern telling off from the lecturer. Those Suns didn't have a great speaker, but it was loud.
As a tech support bod in the Uni, I got a phone call from one of our security guards. I was surprised, as they don't generally use computers.
When I went to see him, he showed me a computer that had been set up near to the security desk, so students could check the status of books in the library. Windows was locked down so it would only run Internet Explorer (sad, I know) and supposedly, it was on a Private IP so could only see University web sites.
Supposedly. Turns out it'd been given a public IP for some reason. While IE was locked down so it didn't display a URL bar, somehow the guard had gone to a porn site. This computer was on full display.
When I got there, he had hundreds of popups. I managed to close 160 before I persuaded the machine to restart, which closed the rest.