One day with no A/C in the dock, a couple of the men was doing a leak check on a 737-200 aux fuel tank bladder cell. (it had been removed from the A/c)
It was supported over an table hanging 5" above this sopported by a hoist.
They slowly started to inflate the bladder cell with air, and this caught many peoples attention.So there was a relative large croud watching after a while.
I was walking towards them from the other end of the hangar when I noticed a empty 1 liter plastic bottle connected to an airhose was being slowly put under the table, then some seconds later a big loud bang and the bottle departed the bottleneck.
Everybody tought the bladdercell had exploded so they thru themself on the hangarfloor ...
When they realized what had happened they ran after the one that had used the plastic bottle joke on them.
He got his punishment afterwards,,,, later in the week he was in an raiser checking the stabilizer. People changed to ground control of the raiser and then washed!! him with a firehose (cold,cold water)
A very strange view I must say... LOL
Another one was an electrician that was in cockpit during the later final part of the C-check, he was rewiring some components.A engineer was entering the cockpit ready to do some functional checks. The electrician was not happy being disturbed by this engineer so he did some really bad farts....(He was famous for them!! he used to eat several days old airline food!).
So the engineer had to escape almost barfing. He complained to the hangar foreman, he then entered the cockpit, the electrician made another fart and the foreman had to eascape as well...
he then made the sarcastic remark.... let him do that job before you continue..to the engineer he is so full of s*** that we will probably have to change the seatcovers on the cockpit seats after he has been there.