My mind has went blank! Help !

I’m a massive fan! I could most probably recite the series! But I am really stuck with this one, It’s in my brain somewhere but I simply can’t remember.

I can’t place the scene, the story, and worst of all … who said it !

The line is

“ well you must be pretty mad at yourself right now “

I can hear it being said but cannot place it , Please help! Thank you