Office prank
When I decided I was fed up with my summer job and probably wasn't going to work there when I finished uni I instigated a couple of office pranks although only 1 could be described as vaguely evil:

I was working for a large contractor who mostly repaired broken pipes and laid some new ones so lots of digging up of roads was involved. By coincidence there was a road which required a small bit of pipe to be replaced where lots of new ones were also going to be laid so being good one department of the company did the others' work and then drew up an invoice to give to the other department.
What should've been about £500 of work got charged as more like £50,000 (although this later turned out to be an accounting typo).

Anyone who's been involved in digging up roads will know that theres a lot of paperwork involved mainly so if your bit of tarmac falls to bits the council can send a 'defect notice' and make you go back and fix it. We decided to make up one such notice and send it to the other department for the work they had just done and describe it as dangerous (i.e. needs to be made safe within 2 hours). About 10 minutes of playing around in word and hey presto we had a very official looking bit of paper which we faxed to the other fax machine about 10m away.
An hour later the other department's boss came in asking if we knew anything about it which we all denied so he phoned up some people to send them out to sort it out ASAP.
It was only after he put the phone down and everyone else was sniggering that someone let on and we had to tell him 3 times before it sunk in.
He quietly walked off red faced and he didn't bother us again for a couple of weeks.
( thistle, Thu 13 Dec 2007, 21:59, Reply)