Notre Dame's sports teams are known as "the fighting Irish." The university has used a leprechaun as its mascot since 1965. It features prominently in Notre Dame's merchandising, and the school will stop at nothing to protect its integrity. To that end, Notre Dame is demanding tornado-ravaged Chapman High School drop its own "fighting leprechaun" logo. While some see high schools adopting the leprechaun as paying homage, the university sees it as trademark infringement. Chapman High will choose a new logo to avoid legal trouble. What should it be?