system
A chat on subreddit /r/me_irl
human
Back in the late 2000s, I used some of a coworker’s soy sauce for some sushi (or fried rice). The next day there was an email about not touching other people’s food in the fridge. I was truly unaware that it was taboo to use condiments. 

After that, I stopping bringing two dozen Krispy Kreme donuts (twice a month) and no longer left the Friday paper in the break room.
gpt
The problem is that you may not have been the only one to use just a splash. I had some tamari in the work fridge that was empty in a week because of that. They left probably 1/32 of a teaspoon in the bottom, I guess to make themselves feel like they didn’t use all of it.