I've twice had soda cups thrown at me, both times they missed. Apparently they aimed as if I were a stationary object instead of a moving bicyclist as they landed just behind my rear tire. Goes to show you the intelligence of the type of people who throw things at cyclists.

The only thing I've had hit me that was memorable was a swarm of tiny hard bugs--it sounded and felt like somebody threw a handful of uncooked rice at my head. We recently had a butterfly migration in the area, it was pretty cool riding with them until I had to head back and ride into them--getting hit in the face with a big bug like that is kind-of creepy.