[megamon88]

Well, they kind of all already had their mess ups. They all seem to happen when their cutie mark ability fails.

Applejack overworked herself when she couldn't harvest apples fast enough.

Twilight got angry when she couldn't figure out why pinkie's pinkie sense worked.

Rarity got stressed when she couldn't make the dresses in time, and when the fashion show failed.

Rainbow dash was anxious when she thought she wouldn't be able to do well in the young flyers competition.

Pinkie pie got depressed when she thought nobody liked her parties.

Fluttershy lost it when she couldn't get close to the animals at the gala.