[deltarholamda]

Because one car becomes one car and a boat, and then it becomes one car, a boat, and a project car that is always being worked on. Then the brother-in-law moves it for a while, and it becomes two cars, a boat, a project car, and an assortment of quad-bikes.

Does it always go this way? No. Does it go this way often enough that people worry about it? Yes.