Pretty minor, but while working on FedFunds/Eurodollar trading software at a big bank, I came in on the weekend and reconfigured my cubicle walls so that the entrance was in the same aisle as my coworkers, rather than being on the opposite side and having to walk all the way around to talk to them.
Normally I believe that sort of thing involved the maintenance staff, etc, at who-knows-what expense.
When one of our co-workers was out on vacation, I put a panel across his cubicle's "doorway" opening. The maintenance guys were more than happy to help. ;-)
Another time I started looking through a cardboard box that had been sitting outside my cube for months. It had office supplies and things in it. I started eyeing items like a stapler.
The guy in the next cube pops out and says "those are her personal effects!". Apparently the older woman in the opposite cube (I never met her) popped her clogs at some point, and this was her unclaimed stuff.
Oops!
(Okay, that's unintentionally-cringe-inducing-naughty, not hack-naughty. But I find it amusing these days.)
What is it about personal effects and banks. I took over someone's desk when I started my current job. She left all her worldly possessions (and then some) in the desk. Wanting to have storage, I asked if I could throw all that crap away. "No, she still works here."
Normally I believe that sort of thing involved the maintenance staff, etc, at who-knows-what expense.