How come Superman stops bullets with his chest, but always ducks when someone throws a gun at him..?

There is the possibility that when the gun hits him it will go off and fire a bullet at an innocent person.

Have you ever dropped a loaded gun??How come Superman stops bullets with his chest, but always ducks when someone throws a gun at him..?For the same reason we're expected to believe that no one recognizes him as Clark Kent just because he wears glasses.How come Superman stops bullets with his chest, but always ducks when someone throws a gun at him..?
He also wears his underpants on the outside, and no one laughs at him ... not in the cartoon / movie anyway ...How come Superman stops bullets with his chest, but always ducks when someone throws a gun at him..?this question is as old as the comic...

got a quesiton that isn't 90 years old?How come Superman stops bullets with his chest, but always ducks when someone throws a gun at him..?
I Know ... Right!How come Superman stops bullets with his chest, but always ducks when someone throws a gun at him..?perhaps just what he has to do when it happens, because his just an actor, doing most of what the director says.