Bill Gates makes cameo at party for Mark Zuckerberg's 40th birthday

Bill Gates made a cameo at Mark Zuckerberg's 40th birthday party, which featured a recreated version of Zuckerberg’s Harvard dorm room. The party, organized by Zuckerberg's wife Priscilla Chan, included personal roasts and a multi-layered cake. The event celebrated Zuckerberg's milestone with friends and family, and even featured a UFC-style octagon.