My coffee cup at work is filthy, no two ways about it. I never wash it and there's a layer of brown coffee molecules coating the inner surface. I tell people I owe my superior immune system to it. About once every six months, someone caves in and scrubs it out on my day off.
The coffee machines at work were replaced last year and have a much lower clearance beneath them, leading to an unspoken agreement among the coffee drinkers in the office to use a small communal coffee cup to transfer the black gold into the half-barrel mugs many of them are carrying. This morning I noticed the communal cup was identical to my filthy one.
As I may have mentioned before, I come from a long line of tricksters, jokers, bullshitters, and benign assholes. So, should I swap my cruddy cup for a pristine new one, forcing one the poor people with their enormous mugs to clean my polluted cup for me? I haven't quite decided yet. Since I won't be around to see the reaction, it might be better if I just imagine it.