Look at me! I'm a silly butt!

normally i can imagine pinkie pie doing something as wacky as that, but it was twilight mooning cadance in the screenshot
i made a custom screenshot of pinkie pie giving twilights behind a face, and judging from this vector, i guess you can say shes going along with the joke 
and im telling the truth right now, i feel completely ridiculous for making this

my little pony (c) hasbro and lauren faust