M THEORY
The ultimate version of the string theory, like the universe's secret sauce. It lives in 11 dimensions, which is basically the universe's way of saying it's too complicated for you.
My brain exploded trying to understand 11 dimensions. I think I'm still in the hospital.
If you can wrap your head around 11 dimensions, you might be a god.
That theory is so complicated, even my dog doesn't get it.