Will you give up your life for your best friend?

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I've been thinking. In many situations we hear people say (mostly in TV)"I'll give up my life for blah blah..." But the more I think about it, the more i'm convinced that real people aren't that unselfish. Everyone values their lives, and everyone's life is valued, perhaphs, only by themselves in reality. I'm not talking about parental relationship here, but real life friends and foes. So, tell me: Will you give up your life for your best friend?