1972 Richard Petty STP Plymouth Road Runner
Richard Petty only raced cars that were "Petty Blue," a color his father accidentally mixed with leftover paint. When STP approached Petty about sponsorship and changing the color of his car to satiate corporate interests, he refused. STP buckled and just slapped a big-ass STP sticker on the hood. ESPN produced a documentary, Petty Blue, on the topic.