Good bit
I do wonder if Harry Potter is going to be the go to reference point for nerdy 20 something year olds from now on. I haven't read or watched Chambers since its release, but I distinctively remember this scene. Ron looks disgustingly funny.
I laughed at the joke. But I do think that it would be sort of better without the intense violence, like, you can want to masturbate as hermione without going out of your way to bash her head in.