Motivational Rainbow Egghead Dash...

My Little Pony: Friendship is Magic season four episode four 'Daring Don't'.

Rainbow makes this face when Daring does witty banter with Ahuizotl. It's something children might not understand, but she just had to make this face in response to what Daring says. The general quirking of the eyebrow suggests a lot doesn't it? It's the kind of face you'd make after hearing something exceptionally interesting.

It is to note she cares little about her overall egghead status or reputation where Daring Do is involved, especially after going into a discussion with Twilight about the books she loves while their friends stand off to the side and watch.

I just really liked this face, it really added charm to the moment.