You think Rarity reacts bad when she gets a speck of dirt on her hoof? How bad do you think she is going to be when Twilight shorts out her cloak with Jarate?

Its funny how people assign ponies to a specific class, mostly because they just...somehow FIT! Obviously some are a bit of a stretch, but Rarity being a Spy and Twilight being a Sniper fit like Tetris Line Blocks when they are needed most.

Rarity/Twilight from My Little Pony
Spy/Sniper/Piss Jar from Team Fortress 2
Tetris was not show in the image and doesn't need to be referenced :D