Tax stuff is very much on my mind right now. Of course, making jokes, in public, about the IRS is a lot like wisecracking about bombs in the airport - they have no sense of humor about that shit.
But still, I laughed when I read this:
Illegal income. Illegal income, such as money from dealing illegal drugs, must be included in your income on Form 1040, line 21, or on Schedule C or Schedule C-EZ (Form 1040) if from your self-employment activity.
I think I should not say any more about exactly why I find that so humorous. But it's definitely amusing.