I've had all manner of stuff thrown at me over the years, including bottles and cans, a ball of ice, and on an organized century a guy sprayed several riders with a squirt gun containing something that might have been urine. A lady I know had a kid hit her with a grape Slurpee right in the chest.
My ex-wife was out alone and a guy leaned out of a car and slapped her on the butt so hard there was a red mark when she got home.