#3902201 - safe, artist:whateverbender, edit, derpy hooves, pegasus, pony, g4, animated, ass up, box, bubble butt, butt, butt shake, cute, derpabetes, face down ass up, female, frame by frame, gif, loop, mailbox, mare, perfect loop, plot, pony in a box, simple background, squigglevision, tail, tail wag, tumblr, white background

I cropped it so it focuses on just Derpy, plus trimmed the loop down to twelve frames so the box doesn’t also bounce.