Recently found in New Zealand, they grow to be about the size of a man's fist and live up to 20 years. Of course they still move as slow as, well... a snail, so still not very scary. If Uwe Boll is reading this they probably won't make for a very convincing threat in a horror movie. I mean, that leading woman would have to be running in spike heels and fall and break her ankle. Even then she could crawl faster than they move.
Better carry some salt anyway, just in case.
Be seeing you.