I loved this episode, it was so wonderful in it's parody of Poirot!
Lead piping in the library! <3
The whole scene in the kitchen had me giggling madly, I loved that Donna correctly guessed that her kissing him would be a huge shock.
Amused by Donna's continuous attempts to seem upper-class English. And the fact that unlike Martha and Rose, she keeps doing it!
"Snatched Lady Babbington's pearls from right under her nose!"
"Funny place to wear your pearls."
Donna and the magnifying glass! <3 Also, I loved her trying to find out if Noddy was real!
"There's a monster and we're chasing it!" and then later "Now it's chasing us!"
"Show yourself! ... Aww, that's cheating!"
Donna Noble, you are wonderful! She was on fantastic form tonight and is rapidly becoming my favourite companion. She had great quips, I loved the fact she was watching the big reveal as if she was in a movie with popcorn, it was all just wonderfully done.
Those wavy screen reminiscent things amused me greatly, particularly the exceedingly random one with the Doctor wandering through Belgium with a bow and a arrow - same one as when he bumped into Sally Sparrow!
I loved how they kept slipping in references to her book titles as well.
<3 the Doctor's chest of things beginning with C!
Excellent episode, 9/10