"Un carambolage" is one of several ways to say "stack" in French... (S'ecraser would be my favorite, but that applies best to being run down and squashed like a bug.)
My girlfriend... erm, she's now 47, so I suppose that makes her a... ladyfriend?... was out riding around our neighborhood in Vence (sleepy little 'burb about 12km north of Nice, France.) She came speeding round a bend only to have a very ferocious (and very small) terrier dog of some sort give chase. The little beastie somehow got beneath her front wheel, and she swerved to the right, directly into a utility pole... BAMMM!
My gir... er, ladyfriend... ended up with: hairline skull fracture, jaw fracture, a compression fracture of a mid-back vertebra, a badly bruised hip joint, and various sprains and pulled muscles. She hit with enough force to BREAK the top and down tubes on the bike, and the fork was bent so that the front wheel rubbed the frame. (With little effort, I managed to wiggle the bike into two pieces.)
She was hospitalized for a week, was in a back brace for six months, and ten years on, still walks with a slight limp. Her magenta, Suntour equipped, Fuji Sagres tourer was a complete write-off, and all of this occurred just three days before we were to fly to Portland, OR for her family's every-twenty five-year reunion. Obviously, we didn't go.
The little dog, whom we'd come to call "Toto" was uninjured. My lady, seeking recompense for her injuries, ended up suing the dog owner's insurance company. A year later, she claimed 70,000FF, which worked out to just $14,000 at the time. She has not purchased another bike, nor shall she.
Moral? Beware the big dogs, but pay special attention to those little barking rats!