This happened to Mike on his cb750 I was following;
he approached a T junction around Anglzark reservoir and the road has a weird off camber at the edge.
Mike stops for the junction as a car approaches so he puts his left foot down onto ..thin air. over he goes and its quite a steep drop too (say 1/2 meter) so he seriously comes off the bike.
I thought he was reallyhurt till he got up then I rag into him as we all would have!
he got his own back a few weeks ago, but I blame Tommyxs for that one