Would you risk this?

I'm watching "America's got Talent" which is one of those fun shows with a wide variety of talents on display. This evening I have watched a man let spiders crawl all over his face, several singers, a contortionist and more.  But the act I just watched gave me pause.  Would you, as a parent, let your 7 year old son throw knives at you?  His dad survived and they put him through so next week, he says, he'll be throwing knives at his younger sister. Sharp knives and siblings?  I don't think so.