Yep, I see them quite frequently. Not too long ago, on the homeward commute on a busy 4 lane street, I looked across the street and saw a guy, old enough to know better, riding wrong way. And up ahead, a car trying to pull out of an apartment driveway to turn into the oncoming traffic. About 1 second after I was saying to myself "uh-oh", the car pops across the sidewalk into the street, driver looking left, toward the oncoming traffic, away from the cyclist. I see the cycle's front wheel crumple against the car's fender, see the cyclist bounce off the hood, but luckily he was going slow enough that he kind of bounced back onto his bike. No place for me to stop, so I drove on, but could see he was back on his feet. Hopefully not hurt too much, and hopefully wiser from the experience. I know I am, every time I'm in the car in such a situation, I'm looking for those wrong-way cyclists.