At first I was like "awwww Pinkie has a sad". Then I was like "awwwwwwww Pinkie has a saaaad!" Then I was like "YAY MORE DERPY".
It feels like Weird Al really connected with the writers here, they put him in pony form and gave him a bunch of songs and he just took it right over the crazy cliff. I've always liked Al's music, but seeing him like this was great.
I love how they've brought Derpy back as a permanent background pony. Even if she doesn't speak again, I'm just happy that my favourite pony has gone from the utterly ridiculous "Where's Derpy" bollocks in S3 to doing goofy things and even interacting with the main cast in S4. To me, it feels like FiM has been made whole again, and as a Derpy fanatic I am content.
EDIT: Now that I think about it... how did Derpy NOT burn her muzzle drinking chocolate fondue? :eep: