this is a paradox which occurs when someone asks you to 'not be nice to them'. Here, if you do not behave nicely towards them, you are actually listening to them, and thus being nice. Whereas, if you don't listen to them, you'll be acting nice to them. And thus, there is no appropriate action to this command/request.
Dude, she asked me not to be nice to her, but that request makes no sense, isn't the mandatum paradox exactly about this?
(noun) A thin, wispy moustache, usually hugging the lipline. Just a few hairs thick, and usually extends no further to the sides than the mouth does.
Usually the only facial hair that 14- or 15-year-olds can grow, it is left unshaven as a display of how manly the child has become.
Though occasionally worn by grown adults, the mandammit is the hallmark of teenagers insecure about themselves, but proud that they can grow facial hair. These teenagers are usually male.
"I am a MAN! DAMMIT! Don'cha see my friggin' sweet 'STASH?!?"