From watching My Little Pony, I learned the begining of Adventure Time's season 4 commercial can sound a lot like something from My Little Pony.

here's how it would be:

as Finn and Jake are on the phone in the begining it would resemble Finn saying; "I'm gonna do a sonic rainboom!"

when they high-five after being launched that resembles this; "BROHOOF!"

and when they hit the ground resembles the boom.

All the rest of the commercial is unrelated.