Nope, not me. Never ever ever.

Oh no, my nose just went through my monitor.

Once off the tandem - back wheel got jammed when the world's best stoker's jumper jammed the back wheel, kept things upright till stationary and she'd stepped off, then toppled gently to the ground. Story and many funny comments on this forum somewhere

Once off my single, hit a patch of deep soft blown sand (occurs a lot here), down before I knew it

Almost did it on my first ever try with clipless - was trying out a bike belonging to a friend. Borrowed his shoes as well as the bike. He takes 12s, I take 10s. No unclipping possible, lots of foot rotations inside shoes as big as boats