I've been playing around with part of this in my head for a while, but there wasn't much of a song there before.
I feel like the first few notes are a sing-songy thing we used to do as kids. I don't know if this is common, or specific to my own childhood. Sort of a "Nyah nyah-nyah nyah-nyah nyahhh" teasing or taunting sound. So I've always thought it might be interesting to make an actual song out of it. At least, I think so. It's hard to know for sure at this point. But I'm pretty sure I'm not making that up... XD