Here's the reason why we get so frustrated with federal income taxes. Yesterday the senate voted on an energy bill and it was reported that Alaska senator, Lisa Murkowski voted no by responding Neigh!" Neigh being a horse sound. She did this because inserted into the energy bill was a Horse Protection Act which had nothing to do with energy and would only serve to waste money.
So there's that, one of many insertions into spending bills having no purpose to the bill before them.