Not that it's the only way to discipline, but I'm not opposed to spanking kids, although I wouldn't choose to go that route myself. I got spanked when I was a kid - it sent a message, but there was no lasting pain (just the initial sting) and certainly no injury, bruises, cuts, etc. It was just enough to get my attention and send a message, not a total butt-woopin'. Contrary to what Thunder says, my parents were anything but "pieces of $h!t". I got spanked, it smarted a little bit, but I was fine and I knew darn well not to do it again. There's a fine but distinct line between discipline and ABUSE.. A little discipline goes a long way. Just don't do it with a stick.
Unfortunately our society has gotten to the point where if you spank kids, child services will show up on your doorstep. We've replaced that with "time outs". Yeah, that'll teach 'em not to do it again.