For documenting the accurate number of hours I worked, in a teaching lab. The department head didn't believe that the lab I taught (as a grad student) needed the hours it was given. Keep in mind, I had to do everything for the lab: create the lab manual, design lab activities, get ethics approval, create lab lectures, setup and clean up the lab, and do all the marking.

Turns out, the department used that document to pay me. This was never explained to me, usually we just get paid the set amount of hours, and I was of the understanding that this was just an audit of my hours to justify what I was getting. Turns out I worked about an extra 30% of the hours set for that lab for the semester. As a result, the department couldn't fully pay me until the following year because they didn't have it in their budget to pay for that extra 30%.

I ended up getting an ear full from the department head, but he backed off when I told him I was simply doing what he asked and that I wasn't inflating the numbers to get higher pay, since I had no idea they intended to pay me based on that audit.

Perhaps it's coincidence, or perhaps it was petty revenge, but later that year at gathering of the faculty and grad students he announced that I had won a major scholarship (one that would've paid pretty well for a grad student), and had me stand up in the crowd along with the other winners. Then, immediately after the assembly, he runs up to our lab office to tell me he read the sheet wrong and I hadnt actually won the scholarship, he just read the wrong name. I spent the next few days shamefully having to explain to everyone that, no I didn't get the award.

*edit: spelling mistakes.