A similar thing happened in the UK , the tax man got narky with a food manufacturer over a cake/biscuit (cookie for our American friends) distinction. Cakes and biscuits are taxed differently.
This little blog-post thing explains it better than I could.
Huh. Only ever heard about these bugs, never seen it written down. Guess I'm today years old when I found out they're not actually 'Dunebugs'.
Every day's a school day.