Three times that I can remember.

1. Going down a bridge there is a zig-zag kind of shift and some idiot was trying to pass me on the inside, he hooked the handrail and slammed into the ground, a seocnd before he did that I felt he bumped my rear wheel. I am glad he didn't take me down with him.

2. Same bridge, the other direction, I slow down for a pedestrian, fixter tailgating me misses me by inches, slightly touching my panniers. Of course, he yells at me that I'm not supposed to stop like that on a bikeway. Like what? Sorry my brake lights are out: put some brakes on that thing and don't tailgate.

3. I stop for a red light, guy behind me doesn't expect that, hits his brakes and touches my rear wheel. I said "red light and there are people crossing the street" He calls me an idiot and takes off forcing his way through the people.