The $15 Theory

The theory that charging your friends $15 to hangout with you is moral and socially acceptable.

Often the theory is used when you irresponsibly buy something unreasonably expensive, then find an excuse to make your friends pay for it through indirectly using it.

"Hey guys, I bought this new console, so every time you guys come hangout and use it, I'll need you to pay $15. It's only fair!"
"I know you're spending the night, so have you ever heard of the $15 theory? Yeah, I'll need you to pay me $15 to sleep on my new couch."

The Bluey-weed Paradox

The paradox that results when one smokes or otherwise inhales cannabis then, as a full grown adult, proceeds to watch children shows all the while claiming it is an adult show, despite the show being designed for toddlers.

"My buddy keeps watching Bluey and smoking weed! He's fallen for the Bluey-weed paradox."