For the past several months, I've been sending american-flag-belt-coworker almost-weekly network messages through an app he logs into that I have full admin on. The message pops up in the bottom corner of your desktop, and gives no appearance of having anything to do with the app it's coming from.
For the first few months, he only received this message, over and over:
I'm a real piece of shit but I can put a straw in a Capri Sun one-handed so it pretty much evens out. Nightcrew mod. Jorts Authority. She/they.
Unstoppable shitposting engine.