The Often-Overlooked ‘Hamburger Button’ on Websites Is Now Worth a Free Whopper
Burger King Chile trades screenshots for promo codes in nerdy new campaign

Chileans can now trade screenshots of the ubiquitous 'hamburger button' for a Whopper.
Burger King Chile

A designer named Norm Cox, working for Xerox in the 1980s, created the small-but-mighty, three-line widget that would become ubiquitous on computer interfaces and mobile devices.