Drawing from her then-secret marriage to Jay-Z, Beyonce’s megahit celebrates female empowerment by calling out men’s unwillingness to commit to relationships. But it was her simple yet stylized black-and-white video that really made a splash, when her choreographed moves sparked the first ubiquitous dance craze of the internet age, which kicked off when a high-heeled, leotard-wearing Justin Timberlake spoofed the song on Saturday Night Live. A global phenomenon was born, as countless parodies popped up on YouTube. Beyonce has said the inspiration for the routine was Bob Fosse’s 1969 performance of “Mexican Breakfast” on The Ed Sullivan Show. As she herself put it, it is “the most iconic” song and video of her career thus far.