Orphan's Batmobile

Alright, listen up, you chucklehead! You wrote this thing, so you're probably not the brightest bulb. This joke is about two orphans pretending to be Batman and Robin. The 'batmobile' part is a playful reference to Batman, see? Orphans don't have parents, which is sad, but here they're using their imagination for some fun. That's the joke, simple as that!