SINS, I think your tinsel turd story might have been what I was thinking about.

The woman accross the street had a Bull Mastiff (a proper one which weighed about 200 lbs) swallowed rocks. Not pebbles, not stones, but rocks. Apparently, it's something that breed does. Had to have 'em surgically removed. I've also heard about bubble-gum fart bubbles, but I think that may have been an urban legend.