Characters making faces
Derpy is not the only pony known for making silly faces. Characters in Friendship is Magic also tend to contract this common symptom during strange occurrences, or sometimes intentionally.
Twilight should stop watching too much TV.
That is explainable.
Pinkie,is just being Pinkie.
I'm not lying!
"What it this...I don't even"
Sliver Spoon, making a derp face.
Looks, like Diamond Tiara and Sliver Spoon both like to make derp faces.
Trixie, you´re the best at facial expressions
Cherry Berry, tied up with Shoeshine, making a derpy face.
You cannot grasp the true power of Sweetie Bells cuteness!
"The pain! It hurts! It makes me derp!"
You know. For KIDS!
"Its behind me, isn't it?"
You're kinda getting to close there, Scoots
Ah'm way too dizzy.
You don't look too good, Apple Bloom.
The derpy dance
Spike, going derp.
"Im warning you Twilight Sparkle! One more step and I'll rip YOU TO PIECES!"
"She NEEDS to sort out her priorities!"
Ya'll right there Shining?
A Pinkie Pie duplicate in a scene edited from Too Many Pinkie Pies
for a commercial, with Fluttershy and Rarity in place of another Pinkie Pie duplicate