For Emergency stop where you happen to be on a patch of black ice, you go sideways - ditto a patch of spilled oil on rain-soaked pavement.

Both wipeouts were totally sudden, no chance to land properly. When my shoulder hit pavement, head snapped over, top/side of helmet went "THUNK!".

Just got up & rode away.

Helmets are less ugly than brains spilled onto the street.