Had my first encounter with a turbo-speed modified Jr. Pac-Man this afternoon. I'd had no idea that such a thing even existed until then!
Pretty nasty surprise, too. The difficulty is greatly enhanced by the fact the scrolling is a hair sluggish; ghosts tend to pop up in your face out of nowhere with almost no time to react. I'd call it the exact opposite of the sped-up versions of the original and Ms. Pac-Man.