You want a 'derailleur', huh? How about a car door opened in your path in traffic? That's always good for a few contusions...at least. Not to mention getting to meet strangers that didn't want to meet you either.
Continuing up the vehicular continuum, the oil patch or leaves in the path of your motorcycle's front wheel. No 'high side', but getting to do the 'third base steal' move with the bike still betwixt your legs....into the opposite lane.
That's real entertainment, folks.
Unhurt, no oncoming traffic to complicate the situation, just a bent bar and a snapped turn signal stalk. And a skid mark on my waist belt....
Best automotive 'derail':
Hitchhiked a ride in V'dub van....Driver looks right and barks "HolyShi" (doesn't finish, van rolls counterclockwise 4X loudly, stops on shotgun side) No seatbelt, both my feet on the seat, left hand on headliner, right hand on shattered side window....
All I had was a small cut in the palm of my right hand.
The nice officer took my account of the incursion; the other car ran the stop sign. The back of the van looked like a pair of enormous pliers had scrunched it into a wedge shape.
And I walked away, still 30ish miles from home.
There....does that count as a derailleur? *L* ;)