It's not actually a billion, it's just a lot. I'm not really good with numbers over a thousand. Or letters past N. That tail end of the alphabet can be tricky. Any letters hanging around Q, V and Z aren't to be trusted in my book.
Keep going for the video, but skip to 1:20 if it doesn't automatically.
Thanks to me, for being brave enough to tape a bunch of Roman to my head like bull-horns and play chicken with a friend.