Wouldn't this give you a nightmare?

Yeah, I think it's edible. I've seen something fairly similar to it when I was at a younger age. I didn't put that thing in my mouth though. :<

Is it the same as the thing we call in cantonese, the "peeing crab/lobster"? D:

Haha I know what you're talking about, but I dont think so. I remember going to a shop in HK that had those live in a tank and it didn't look like that. They actually looked like a large shrimp with a lobster tail.