[hack_edu]

Not even just the plug. I've had outages from bits flipped simply by the static electricity generated when vacuuming near servers.

[linker3000]

5W walkie talkies in a big sports complex with the RF getting into the keyboard controllers and acting like a maniac was punching the keyboard - would eventually hang the servers.

Fix: Replace cheapened-keyboards-with-mylar-film-(not)-screening with older models that had a full metal cage around the keyboard assembly.

[socceroos]

You have carpets in your server room??