Probably your wrist and fingers are a little stronger than mine, to force the scissors to stay in a straight line.
With a little more "grip" and a little less fear of cutting off my fingers, I would take that whole bottletop off with one swipe of a sharp, thin blade.
But I figure that would work great for the first 10-20 bottles, then one finger would go flying through the air and I'd have to change my name to "Frodo".
