This is a video from the coast of Stromboli (a small Italian island north of Sicily) of some boaters getting a good look at one of the island's three volcanos erupting, then high-tailing it out of there as the pyroclastic flow ("a super-dense cloud built of superheated [~1800º F] rocks" -- thanks, commenter Spyeder) enters the water behind them. Me? Not to sound too tough or anything, but I'd never run from stromboli. "The baked bread pocket stuffed with cheese." Like a calzone, yes, I love them. *Italian chef kiss* I'd also never run from lasagna or cannoli. "It shows." You watch it.
Keep going for the video.
Thanks to MSA, who agrees that is not the cloudy with a chance of meatballs you'd hope for.