Sometimes my office mate doesn't come in for days or weeks on end, and always leaves a half-full cup of tea sitting on her desk. I don't rinse it out for her. When she comes back, I tell her I didn't see it, over there, hidden in the corner like that, when actually I've inspected it every day to see how much the mold has grown.
I pretend to myself that I'm training her to wash her teacup every day before she goes home. But really I just like to see the pretty colours growing.
Does anyone else want to share a confession?