good tricks to play on co workers

if some one looses their job over a harmless prank, the ill feelings where there before the fact.    either way this thread if about good pranks to play on co-workers,  don't really need the *soapbox* comments.  

If you can't have fun at work while maintaining a good work environment, then you're in the wrong business.  Whatever bay I'm in, we always have fun.  This is the industry for fun, point-blank and Period.  What guy puts in two subs and an amp because he's bein serious?

If you want stuffy, then push your numbers up and go work in the front office.

A great prank is= a variation of the Horn-to-Brake.  Put in a relay, 85 to turn-signal(-), and 86 to Brake (+), 30 to fused +12v and 87 to Horn trigger (+).  Now the horn will only go off when they are turning and applying the brake.  You're unsuspecting victim usually takes a while before the horn goes off, that way it's not going off in your parking lot.  The look the  next morning is priceless.

Then there's the ol' "put a cut-off stinger on the outside of the roof while someone is doing an overhead" prank.

I got a newbie one day with a string of shipping air-bladders.  I put a string of three of them under the passenger front tire.  When he backed the car out of the bay after his install, BAM, BAM, BAM.  The look on his blood-drained face, was sheer horror.  Ahhh, the days of old.

very very very simple but effective, had a new guy starting at work putting a basic alarm in an auto toyota. he'd finished it all, put all the dash back together and when he wasnt looking we put the gear lever into reverse, he went to test the thing one more time and abviously the starter motor wouldn't turn over. the look on his face was priceless, took him ages to figure out what was causing it.