[njs12345]

I agree entirely. Nonetheless, here's an interesting story about someone being killed by 9 volts: http://www.darwinawards.com/darwin/darwin1999-50.html

[mikeash]

It's interesting both because 9V killed the guy and because he had to try pretty hard (stabbing his thumbs) to achieve it. So, while dangerous, not nearly as dangerous as e.g. 110VAC.