Apple went after a non-profit in NYC. Nuff said.
ETA: Clarification...
New York City 'GreeNYC' logo
In January 2008, Apple filed an opposition with the U.S. Trademark Trial and Appeal Board against New York City's (NYC) trademark application for the "Big Apple" logo for NYC's GreeNYC initiative. NYC originally filed for its trademark: "a stylized apple design" for "[e]ducation services, namely, providing public service announcements on policies and practices of the City of New York in the field of environmentally sustainable growth" in May 2007, with an amendment filed in June 2007. The TTAB's Notice of Publication was published in September 2007 and Apple filed an opposition with the TTAB the following January, claiming a likelihood of confusion. In June 2008, NYC filed a motion to amend its application to delete the leaf element from its design, leaving the stem, and the TTAB dismissed Apple's opposition and counterclaims in accordance with the parties' stipulation in July 2008. In November 2011, the TTAB issued NYC's trademark registration.