Dunno what made me think of this just now. When I worked for IT in a school district way back in the 90s, a librarian told me she kept a supply of mouse balls in her desk because kids would steal them out of the school computers. What I remember about those balls was they picked up dust and crud off surfaces. Pretty soon optical mice came along and they were history.
Yep was one of these kids… From the very same period, removing 10base2 BNC terminators was also a fun thing to do. Both had the effect to infuriate the computer science teacher…
Thanks for the collection of all this…
(later it was the deadly loop on network hubs and tcpkill… all this is impossible now)