Woah, that sucks! Where do you keep your boat?! And... unless their boat is extremely similar, it's absolutely stupid because they won't be able to use it!

I'm lucky that my boat sits in the water all the time, so I'm confident no one is going underwater to steal parts off it. Although a friend found his prop on the bottom of the lake one day under his boat. Either a prank by some clever friends, or he somehow lost the nut and was lucky to back it off when he reversed into the dock while parking. Who knows....