Many of these mentioned happen where I work too. We also have someone, part of our building services dept who takes it upon herself to randomly come and check the fridges, and chuck stuff SHE thinks is old or not labeled etc. I had a small bottle of milk one time, in the fridge, for my coffee. It was in a plastic bag, so no one else would use it. She came in, took it out of the bag, chucked said bag, and was about to chuck the milk since there was no sell by date on it, therefore it MUST be bad. Thankfully, my CWs knew it was mine, and told her to leave it alone!
The toilets are another one; ours don't always flush all on the first try. So I always check, and flush again if necessary. But some don't. My other pet peeve is that we have small wastebaskets in each stall, for female products. there are also bags to PUT them in, or you can wrap them in tp. Yet some still think its ok to just chuck them in, so they're visible to all. EWWWW.
And I also sit in a cube farm, where some people just don't get that a. we are here to work, NOT run their personal lives and b. quiet is condusive to work. In fact, due to my one boss, we moved across the floor! there was conflict between her and our in-hosue travel agent, so we got moved. Where she now annoys others on a daily basis.