Appropriate Currency
There’s a lot of sarcasm on this list but this is up there with the best. One worker advised their colleagues to use appropriate currency when paying for items in the break room. This is reasonable but office staff are a pedantic bunch and love to annoy each other. That’s why somebody insisted on taking things to the next level.

Imagine going to this effort because it’s so dumb. But it’s also quite funny and we appreciate their commitment to the cause. It may not entertain the person who created the original note. Nonetheless, it’s a fine passive-aggressive response that must have made their fellows smile (via Explosion).