Same here ...... Not while touring (haven't toured yet, getting close though sometime in the next few weeks).. But I did have it happen while riding home from the ocean near St. Augustine. What was weird it was a FULL can of beer. Really blew me away that a redneck would part with their beer like that. Missed me by quite a bit, but still bothered me.
Another time near home some idiots in a truck passed me and the passenger stuck out the window and blew on what sounded like an air horn... LOUD LOUD.... So loud that it actually hurt my ear for about 2 minutes. I was riding in the bike lane next to a curb.... Luckily I didn't jump or swerve or anything... I think that was worse than the beer can...