After all the sh*t has gone down Psycho, Norman Bates ends up in a mental institution, where we see that he seems to have taken on his mother's persona entirely. To suggest this in something of a subliminal fashion, then, Hitchcock overlays a cheeky frame of a skull-faced Norman whilst we listen to to him nattering on in Norma Bates' voice. You had to be super quick to get this one paused at just the right time - people went mad trying to do such a thing in the VHS days. Then again, we all go a little mad sometimes, don't we?