This thread is intended to help showcase how a user can teach the bot an unusual set of rules that it may have few training data examples to follow.
You should first check to see if the bot can already do the 'weird thing' you want. For example, the bot knows how to act like #1074204473628573766 . It does not need to be taught how to play that game, there's a huge amount of examples in the training data - enough that it usually confidently follows that instruction, even though this is shockingly different than the bot's usually followed ethical constraints of being kind and helpful. That role is amazingly well trained.
But let's say you ask it to not use the letter E in talking with you.
The bot will cheerfully promise not to use 'E's while using the normal quantity of 'E's to do so.
It really doesn't understand what you want. All it needs is some training - which can be done fairly fast if you are clear and specific, and highly accurate yourself in following the rule inside examples - and then you can have your own rulesets followed inside that chat. (Expect to repeat the process inside new chat windows - and training is a process it seems to need the back and forth with a user about examples. I haven't seen success with a single prompt yet.