I know you might have laughed your ass off right after reading this post's title (and understandably so), but think about it...

Cheese Sandwich is Weird Al's ponysona, and is also voiced by him. At the end of the show, it's revealed he and Pinkie had a filly.

Weird Al screwed a horse dude. He screwed a horse. Holy shit.

I wonder when his fanbase will catch up with this and turn this into an inside joke, kind of like Kanye West with the whole gay fish thing from South Park.