Putting decaf in the regular coffee pot? Now that’s just evil taken a step too far.

The decaf’s response:

recent: The British version of the above note

This is what you get when you mess with us:

In other words: You’re a creep. You’re a weirdo. What the hell are you doing here? You don’t belong here!

(Thanks to Bonnie from North Carolina, Eric in California, and Paperback Writer in Pittsburgh for their submissions!)

related: Karma’s a bitch.

The subtle version (from Denver, Colorado):

And the not-so-subtle version (spotted by Ariana in Boulder, Colorado):

related: Is it really worth $1.59 to spend eternity in one of the lower kingdoms?

extra credit: Coke, Sprite, or Ice-T

This physics lesson was posted in the communal kitchen of Oxford University’s department of psychiatry.

“You would think that these people would be masters of communication,” our submitter says. “Evidently, not so much.”

In Australia, meanwhile, it seems they prefer not to beat around the bush* — at least when it comes to wet spoons.

related: The Ph.D’s approach to air conditioning units

*bad pun intended

If I worked at Steve‘s office, I would definitely be rallying the troops to launch a (non) silent 90° protest of round-the-clock water-glass-filling…and then place “out of order” signs on all the restrooms. (It would be lame, but not as lame as this sign.)

This is not a thing, people! I refuse to acknowledge this is a thing!

related: Is this a thing now?

Our submitter at a university in Canberra spotted this first note while getting his morning coffee. “Pat (a professor in the department) has been complaining for weeks that her coffee mug seems to disappear and reappear spontaneously. Her mood varies with its presence.”

Several days later, our submitter spotted this addendum, written by another professor sympathetic to Pat’s cause. “Since the mug hasn’t turned up in over a week, I’m pretty sure the culprit is too afraid to return the mug at this point.” (Could you blame him?)

related: Not to name names, but…

(After all, once they’ve moved back home into their old bedrooms, they can just raid your liquor cabinet and sneak bills from your wallet, just like old times!)

Meanwhile, this note/social critique was spotted by James in downtown Iowa City, “amid dozens of bars and thousands of over-privileged young suburbanites.”

If, however, your entrepreneurial kiddos do decide to strike out their own, you might want to keep tabs on the Sudafed in the medicine cabinet. (Especially if “on their own” means “the room above the garage.”)

related: Your daughter is a substance abuser and a PLAYER!

Stephanie in Kansas City, Missouri found this warning posted on the fridge after lunch today:

Around the same time, this note showed up on an office coffee-maker in Washington, D.C.:

Meanwhile, Ashley in Greenville, North Carolina forwards this example of a veiled threat, atheist-style:

related: Remember, God is watching you!