The Great and Powerful Trixie Doesn't Trust Wheels
This one was recommended as a poll, but it would probably work better as a discussion post! One thing FiM does well, is produce memorable lines. Be that 20% cooler, to Monitor EVERYTHING, the catchyness is constant.
But what is your favorite line? Maybe something that others don't usually use, but you find yourself repeating? Hit the comments up with it!