how close is too close?

This gives me chills, it's so cool and terrifying all at the same time!! Joanna posted this crazy story about Victoria Falls.  In September and December you can actually swim as close as you want to the very edge of the falls without being washed away to your death.  The area is called Devil's Pool and it puts you smack at the edge of a 420 foot waterfall, one of the largest in the world.

I think this is amazing and I would completely be that person with the camera over the side.  I'm pretty sure I can hear my friend Dennis fainting as we even speak of this...

Just to refresh your memory, Victoria Falls usually looks like this..