In 1995 Budweiser made history with one of the most memorable beer commercials in history... just as long as you don't remember the nearly identical Rainier Beer ad that came before!
Check them both out for yourself. Can you really say the famous ad isn't a rip off? Sure, they took an original angle, but whoever created that ad was clearly a fan of Rainier Beer's advertising (or perhaps were the ones who made it).