I heard tales of students who kept a "skip to
channel 0" job handy
(in the days of electronic, not punchcard job submission, so early
1980s, IIRC)... when they spotted an item (stack of cards, paper,
disk pack!) sitting on top of one of the large printers, they'd
submit the job to run the paper out intentionally, and, here's
where the prank comes in, certain models of large printer would
automatically open when the paper was out, spilling whatever was
on top onto the floor.
In my undergraduate days, I remember the time somebody (not me, I hasten
to add) put a plastic cup of coffee on top of such a line printer. And by
chance (there was no 'prank job' involved AFAIK) the printer ran out of
paper. The result is obvious, shall we just say the printer, the user
concerned, at least 2 innocent bystanders and a lot of printout got soaked...
-tony