Season 1, Episode 13.
Big MacIntosh showing his support at the Iron Pony competition.
SVG: [link] (Without cutie mark, because I added that in photoshop and didn't save a .psd file)
I do not own any characters from My Little Pony: Friendship is Magic.
Credit for cutie mark to
I can imagine him saying something gir from invader zim would say like "YAAAAAAY! WE'RE DOOMED!! "
And there was much rejoicing.
Weird, though, is that even the cartoon makers for get his CM sparkles. In fact, it's common to see hime WITHOUT the sparkles on his CM.
Nice one! I always thought his cutie mark had sparkles around it though.