Ahh these have been fantastic and stressful to read.
Here's mine & It's Christmas related! 
This happened 9 years ago but I still think about it!
I use to work in a Weather spoons full-time alongside studying. I was below 21 so at the time I was only entitled to 5.50 an hour. The rules are you're not allowed to accept any tips and management just spends the whole day with feet up, eating snacks watching CCTV.
It comes close to Chirstmas and boss tells us as incentive that anyone who works the Christmas days (Xmas eve, Xmas day and Boxing day). Can accept tips.
Great! So of course, working bloody hard for my 5.50 I'm excited at the prospect of tips and my family aren't particularly traditional at Xmas so I worked full days Xmas eve and Xmas day.
On Xmas day, boss announces that instead of accepting the tips individually, they will go into a tip jar and money will be spread out fairly so those who work in the kitchen will benefit. Okay, this is only fair I thought.
I collected 5 pound notes, a few 10 pounds notes, pound coins, 2 pounds. Our regular customers had been very happy to finally be able to tip and had really made the most of it!
At the end of xmas eve instead of splitting the money. The boss says tips will be collected through all 3 days and used to go towards a Xmas/NY party instead!!
(I wouldn't have worked xmas day if I had known this and it's not fair as the staff who haven't worked during these days still benefit).
Alarm bells should have rung as we have never had an Xmas/NY party before.
As you can guess- NY eve past and weeks afterwards, those who had worked on those days kept asking. I can't remember what they said, in the lines of we're organising it or phobbing us on to the next sub-manger. Months went past and someone let slip that 3 sub-managers split the tip jar between them!!!! Still gutted about it. I so regret not filing an official complaint or doing something!!