My second-last school.
We had a particularly young HT. He'd worked with many of the staff when he was a lower 'rank' as it were. At our school, he'd been an Assitant HT, Depute HT and had just taken over as HT.
The poor soul tried to be a "good sport". He finished up being tied to a chair while a probationer PE teacher in drag danced round him and thrust his balloon breasts into his face. I found it excruciating, but maybe it's because I'm ND.
Later, the Head of PE - who fancied himself as a joker and had put the rest of the PE dept up to the nonsense with the HT - headed for the Gents.
Earlier in the year, the PE HoD had played various 'pranks' on several other members of staff. While the HoD for Home Ec was out at a conference, he'd wandered into the Home Ec Dept with a clipboard, nodded at the probationer there and said "Carry on. The Head asked me to give you an crit lesson in the absence of your HoD." Really not on.
At the Easter do (no alcohol and held in the staffroom) he'd gone up to a probationer in our dept and grabbed his plate of snacks, saying "Thank you, Waiter!" Our probie whispered something in his ear and the HoD went pale.
Our probie was a mature entrant to teaching. I later found out he'd said "Call me 'Waiter!' again and I'll peel your nose off your face..."
That's only a sample of his work - but he seemed to pick on unpromoted staff in particular.
Anyway, at the Christmas do, while he was in the loos, another staff member came up to the PE chap's chair, dipped his hand into his jacket pocket and extracted his car keys. He made a "Shhh!" gesture to the rest of us. (This included a member of the SLT.)
The keys were returned without the PE chap realising they'd been gone.
Towards the end of the evening, the Head of PE came running back into the hall. "Aw, c'mon guys! I can take a joke...but where's the nuts for ma wheels?"
Yup. Some of the other teachers had exacted their revenge for his "pranks" by removing all 4 wheels from his car.