Yes, I do understand that. I was trying to avoid a long involved post when I first posted.
Now, we all know our tax code is not so simple as you make $X, you pay X%. There are tax credits, etc for various things as long as you make under a certain amount of money. My little fun job brought in just enough money that we were no longer eligible for one of those credits. So, while, technically, my income wasn't taxed at 100% because of a higher tax bracket. The net result was the same. Our tax bill went up by more than the amount of money I earned.