“These go to eleven.“
I know people who feel the funniest moment in all of film is the bit in This is Spinal Tap about the volume knobs that go to 11. It does seem clear that the bit has become a well-known cultural meme. Just about everyone (who’s anyone) knows exactly what you mean when you refer to turning it up to eleven.
For those of you just exiting the cave (Plato’s or otherwise), here’s the bit: