Personally, I find it inconceivable that any writer could come up with such a wonderful list.
Here's a few to refresh your memory:
"You keep using that word. I do not think it means what you think it means."
"At a time like this that's all you can think to say?"
"Nonsense. You're only saying that because no one ever has."
The Princess Bride (memorable quotes) is one of my favourite films and I'm sure it's one of yours. There are no doubt lines from other films that could be re-purposed as essay comments or even lines that could be slightly altered and would make terrific sense as essay comments.
I can think of one from TPB: "Hello. My name is Professor Montoya. You massacred my essay. Prepare to fail."
Or perhaps from another film that's been a source of a lot of sayings, "Of all the classes, in all the universities, in all the world, you walk into mine."
There's got to be more...let's see what we can come up with in the comments!