A few people seem to have done this
I used to work with a right skinny slacker/spacker nicknamed Smiler, a bit odd he was. As well as being a massive Status Quo fan he had the strangest hair, black as boot polish and bouffant like Fabio. Anyway, over the space of a few weeks, Smiler had been torturing us with the tale of his seduction of a married older woman and the sex they'd have while her fellah was out. Deciding we'd had quite enough of his bollocks we decided to get our own back one night.
Borrowing Smiler's phone it was easy to get his number, so on the nightshift, around 2am my mate at the time called from another mobile and did his best irate husband voice while we all watched Smiler's reaction.
"I know who you are you cunt! Shagging my fucking wife!"
Despite looking a bit pale Smiler put on a brave front "y... yeah? what're you going to do about it?"
"I'll tell you what I'm gonna do fucker, I know where you work, I'm on to you" Now Smiler got really scared, visibly shaking he looked at us and pointed to the phone, mouthing the words "help me". It was at this point we should've stopped it but we were too busy holding in the guffaws, my mate continued "In fact mate I'm already outside, I'm going to FUCKING KILL YOU!" he said the last part so loudly Smiler dropped the phone, while another workmate, sequested outside, hammered on the nearby door with a crowbar.
Smiler? Well he did the only thing you can do in a situation like that, he shit in his pants and fainted.
After he came around and quickly cleaned himself up he hid in the office all night with a chair against the door. We talked amongst ourselves and decided we probably shouldn't tell him it was a joke, the poor guy lived in fear every day after that, stopped the stories though.
(Suddenly, zebras Safe and sound for eternity, Mon 13 Nov 2006, 19:02, Reply)