Enough said, really.
Update 09/20/04: Okay, so I finally got a chance to try the iMac G5 in a store today and it's surprisingly stable. A simple wack would definitely not take it down, you'd really have to push on it from the side or from the back to knock it over. Very cool.
The zealots are still out there (read the comments to this page), so once again I reiterate that this was a joke based on my initial impressions.