He was a regular Keyser Söze.
I saw The Usual Suspects at the theater with my wife. She guessed the end before it happened.
I had seen decades of the usual who-done-it plot on TV; Burke's Law, Columbo, Murder She Wrote, ect where the villain gets two sentences of character development in the first 5 minutes, a whole show of red herrings, and then the villian shows up again at the end.
But my wife had been reading murder mystery novels, and had already seen enough plots the same as The Usual Suspects.