The water in that area in some places flows through narrow channels, narrow enough that someone with enough ability could jump across. Wanting to get onto those rocks on the other side makes the temptation that much stronger. You want to see if you can do it. That is your only thought--making it across.
There is a drop off. It isn't extremely high--nothing like Yellowstone Falls, for example, either in height or water volume. But falling off of that 30-40 foot falls is enough to hurt you badly, so that you would likely be unconscious by the time you hit bottom and end up drowning.
I would like to encourage those reading this to never take unnecessary chances when it comes to waterfalls, and be careful around water in general. A few years ago there was another such accident when a young man tried to wade across Big Cottonwood Creek during runoff. Don't let it be you.