Several years ago pedalling quite quickly along an estate track I came across a small bridge made from old railway sleepers that were laid in the same direction as the track rather than perpendicular. Unfortunately there was a gap between the sleepers exactly the right size to grab my front wheel . . . front wheel came to a sudden stop . . . bike (with me on it) rotatated around the front axle . . . landed flat on my back still on the saddle and clipped in with the bike above me. Sorry, no videos.