What are some trippy thought experiments?

My favorite thought experiment is Maxwell's Demon. The thought experiment itself isn't trippy, but its implications are... one of which is the equivalence between energy and information. This thought experiment implies that information can be converted to energy. It has been confirmed experimentally. read more

EINSTEIN’S THOUGHT EXPERIMENTS – Proof of non-existence of Ether. Thought experiment is a purely imaginary experiment that is conducted only in the physicist’s head, usually because it involves a procedure that is not in practice achievable in the real world. read more

Here’s a compilation of the most interesting trippy thought experiments found on a popular Quora thread that are so mind boggling, they will change the way you see life. Some of these may not align with certain scientific discoveries and theories. read more