A note to all who would use the "self defense" routine above: It is illegal to shoot a Canada goose out of season. It is illegal to shoot a Canada goose in season without the appropriate permits, stamps, and firearm/non-toxic shot. This is a Federal law. All it takes is a not-so-understanding neighbor, some evidence, and you might be going to the Federal pen.

And yes, urban geese can be a significant problem.
Don't ever let them nest on your pond. They have high site fidelity, and those babies will return to make their own little ones.

Sorry if I came on strong. I just don't want to see anyone getting into trouble over something as silly as goose poop on their lawn.