Thread: Small revenges

What minor revenges have you got on people?

Here is mine;
i left a 4 colour pen at work, the back to back crew is 2 guys, and my pen went missing, so I thought "fair enough, they probably needed a pen". The next day I left a 4 colour pen out on purpose to see what would happen, and it went missing, so the 3rd day i got 4 4 colour pens and took the green cartridges out of 3 of them and loaded the 4th with all green ink, I came in the next day and found it left in a drawer, along with a notebook with green scribbles all over the cover.
Hopefully they found out when they were signing something important.