and if u think u can save ur self from this kind of attacks in reality.. i would consider getting a gun!
One more thing. I'd like to add that I really disagree with the idea that this topic is only of interest to those who want to learn "street self-defense." I have no problem with those people, of course. However, myself, I'm not really interested in that. (Sure, it'd be nice if martial arts also gave me some capabilities I could employ in a future violent situation, but it's not high on my list.)
Rather, I think this is really important just to understand the principles and rationale of aikido.