Why you throw a gun at Superman

[ShinMaruku]

http://www.youtube.com/watch?v=AjgJ3gMF2sk
If it can work on Dracula it must work on Superman right?

[Alnet]

If the gun is made out of Kryptonite, yes.

But then you can just pistol-whip him and call it a day.

[Vanzazikon]

You can just point the gun at him and he'll fall on his knees.