I don't have any problems with them but then again they know they are not welcome as the dog and I run them off if they show up. I usually throw rocks at them and although I don't hit them they get the message by the splashes in the water right next to them.

I also have pier that goes across the middle of the pond all the way across so it's hard for them to just sit in the middle.

I've had great success with bottle rockets with ducks. Never had to use them on the geese.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.