Was to stick a Speaker into the desk Filing Draw and turn the volume up all the way while altering the balance so that only the speaker in the draw made any sound.
When the victim turned on their workstation after logging in they got the sound of a Wild Charging Rhino coming from the draw along with a Audio saying For Gods Sake don't let it out or we'll all be killed.
The number of times that they just walked away for half an hour and did nothing was amazing. Of course the same thing happened next time that they logged on so it was ongoing till they actually did something like call the Help Desk to get the Wild Animal removed from their Desk.
Then at one auto dealer the mechanics liked planting Radiator Conditioner Bottles filled with the Oxy Gas and an old Spark Plug rammed in the top to one High Tension Lead so that when the victim tried to start their car it exploded. Made lots of noise and did absolutely nothing else.
Of course the Apprentice that did it to me was a
Smart A$$ and said that he was free of repercussions because he had a Diesel and no Spark Plugs. I started out making one of these and cable tieing an Old Coil and bottle onto the Frame of his 4 Wheel Drive and a contact switch under a wheel so that when he drove off the switch broke contact sent a big fat juicy spark to the Gas Bomb and blew. Naturally I wanted a Big Bang so I used a 2 Liter Bottle instead of the 500cc that was normal and scared the hell out of him. Not being satisfied with that I then set about making a timer and using that to trigger the Oxy Bomb. The last one was set to start timing as he left work and trigger 12 hours latter so at around 5 AM it blew and had him race out of bed and get done for indecent exposure while looking at his car for what had happened. Apparently you are not supposed to take your top off in the wee small hours and scrape things off the underside of your car.
I had him begging for mercy every day till I left that place and the Indecent Exposure was a little thing compared to the other things he got done for like going to the Police Station to hand in a license for DUI and driving there drunk as a skunk and demolishing the front fence as he pulled up. That was bad enough but they let that slip till he tried to drive away and drove into the front of the building because he didn't want to reverse out.
And because I did the Police Cars I had the Police in on the joke as you most defiantly can not let off Big Bangs in a small Country Town without having them involved.

Col