I've killed hundreds of Geese in my life, mostly with a 12 gauge during hunting season.
However, once I took my boy to a park in Dallas that had a bunch of resident Canadian Geese, and I figured it would be fun to feed them. Well my boy wanted to be the one throwing bread out, so once he did all the Geese in this colony immediately swarmed him. Mind it, he's 10, so I jump in and start ringing necks...I got bruised by wings, got bit a couple times, but I still managed to kill 2 geese with my bare hands. After the feathers settled I scooped up my boy and took off before the authorities could get there.
I distinctly remember the first Goose charging me, head and neck erect with its wings out....I started to run...then I though "Its a fucking 10 pound Goose." I turned back and fought like it wanted me to. He lost.