I kind of liked Robin Williams. Not so much his stand up comedy but I liked his films. He was also a cycling advocate. In a city like San Fran where there are far too many cars, when somebody with celebrity status is a huge supporter of cycling, it's good for the cycling community.
A couple of years ago while I was riding my bike across the Golden Gate Bridge on my way back into the city after a 60 mile loop in Sausalito and the Marin Headlands, Robin Williams rode past me. I did a double-take as he rode by. He looked at me and nodded as if to say "yeah, i really am who you think i am.." I tried to keep up with him for a while, and I was surprised how fast he was for an old man. But I was tired and on my heavy touring bike -- that's what I told myself anyway.