Of course- but the ponies all end up hating you, because you're a human in their world, and it turns out they're only okay with ponies in the human world. The humans hate you for letting colored ponies into your world, and a war breaks out between the two worlds, with both sides hating you, and your house (with the portal) being, quite literally, at the center of the war. I wish that I could turn into anything or anyone I wanted at any time, always being able to turn back into myself whenever I wanted.