One of the things thats been taught in most if not all of my shooting classes is that you can't call back a bullet. Once the shot has been fired its been fired and if your shot hits something that you don't want it to hit such as an innocent bystander you can't undo it. That is why you have to know your target and what's beyond and know where your bullets can land. That being said, bullets are one thing but how about words? Can I take back stuff I say on this board and ask people to forget I said it?