This one's for Cousin Nancy:
Mr. Angry Eagle wants to do your taxes.
In this case, "angry eagle taxes" refers to tax preparation by an angry eagle, not taxation of angry eagles. I'm not aware of any state or federal taxes on disgruntled raptors. If there were, I imagine somebody would organize a mass bird-drowning in Boston Harbor, and that just doesn't seem right.
Seen in Shawano, Wisconsin. Sadly, the sign is not visible in Street View. You'll just have to trust me.