Devilish things.
"I was at University the other day, were all the computers down. Everything. Couldn't log in, couldn't print, no nothing. Went a friend of me to I&A, you know, where they do the computer stuff. Know what they said?
'The server switch is posessed. We called in an exorcist, and he declared the switch officially dead. Now we have to install a new switch.'
..."