Death Horse Beans

... Im kinda baffled and amazed by this one
First thing on my mind is... at what point during the sketch did JJ found it becoming weird... and why beans?

(Im guessing the line of thought during the sketch went abit like this)
Scary wings
Big scary wings
Bat like scary wing
(this will be such a scary gargoyle creature)
Big scary (Temporary ADD setting in) Ooo a horseee ^_^
Where was i?
Big scary horsee.. wait a minute
Errr (genious imagination initiated) Beans!

Or maybe he made a mistake when drawing a line, said "aw, beans!" aloud to himself, and then felt the need to add beans to the picture?

And I'd like to add that the picture is completley badass. Evil Pegasus just rocks.