we had, we also had a restaurant called the Lobster Hut. We sold fried anything in seafood and lobsters, clams etc. Anyhow, out on the docks we had live quahogs in a shallow tank with salt water pumping thru. Well from time to time a seagull would sneak down, grab one and fly up and drop it to crack it open. Usually on the dock or rocks, roofs what ever. but this day, a couple were sitting eating lobster at the picnic tables on the dock and this gull goes up with quahog in mouth and drops it. Well, sadly it land square on her head, and cold cocked her. She hit face down in the chips and shells on her plate. We ran out and the husband was trying to figure what happened. She had a knot on her head as big as a chicken egg I think. And on the side of her table was the problem, the quahog, and it didn't break. The gull was sitting up on the roof, with that goofy laugh call they have. Must of hurt like heck. We offered to take her to the hospital for a check up but she thought she would be alright. They came back again and again over the following years in summer but only took the tables with the sun awnings or ate inside. We kept a rotating piece on some of the boats to keep them off. It helped some but was not fool proof. Like you say, they can really mess up a boat, and the dropings they leave are very acid. Can kill a paint job real quick like. We used to feed them off the docks with our hands. Just stand there with a fish or whatever over your head and they would swoop down and take it....
Geo