Posted from my account on Fanfiction.

Derpy can be a klutz at times. She accepts that. Her klutzieness (it's a word now) has gotten her in hot water before. But now it's dragged in Rainbow Dash in with her. During a race, colliding sonic booms force them to another planet inhabited by humans. (Not earth. It's a parrallel universe that has a connection to earth though.)

Meanwhile, Mary is having friendship trouble. Could Derpy be just the solution she needs? Derpy is going to find out.