There's been this discussion in the Religion and Politics section of the forum and it concerns this. Can you use a gun to defend yourself? At least one person claimed it's a myth and that it never happens.
My take on it? Yeah you can, to take it a bit further you can also defend your home with one. The person I argued with said it never ever happens, he also said that if someone breaks into your home that you can't shoot them. Where I live if someone breaks into your house that is your castle and they just breached the walls so you can defend your property.