It was mighty nice of Ford to wish GM a happy 100th birthday by strategic window-blind arrangement on their office building, but things weren't quite so friendly back in the days before the imports grabbed a huge slice of the car-sales pie. Back in '66, when the Mercury Division was gearing up to release the Cougar, they projected a huge Cougar ad… on the side of GM's Detroit headquarters! GM could have retaliated by using gasoline to burn a big Camaro ad into Henry Ford II's lawn, but they took the high road. Thanks to Mark for the tip. Image credit: CoolCats.net.

Send an email to Murilee Martin, the author of this post, at murilee@jalopnik.com.