I became a brony in late November 2011. I find Pinkie Pie my most favourite character because she likes to eat a lot and breaks the fourth wall.
I was also praticing on doing the Cookie Monster voice while I was doing my Skylanders flash. During production, that was when i thought of this flash.
I did do something similar with the cookie thing but this time it was Mortal Kombat with Scorpion and Sub Zero.
Oddly, a cookie has yet to be introduced to My Little Pony: Friendship is Magic. Although I did suspect that Pinkie likes cookies.