A conspiracy theory stops being fun when it causes harm.

"the government is hiding UFOS at Area 51" is fun.

"Rasputin was a werewolf and that's why nobody could kill him" is fun

"The President is secretly a Muslim and that's bad" is harmful.

"COVID vaccines have tracker chips in them" has literally killed people.

What I'm saying is that if you want to have fun with conspiracy theories, think about what you are having fun with and how it might impact others.