Bill Gates and the Radio Shack Tandy 2000 (1984):
Product endorsement ads like this one weren't unusual for Microsoft's chief honcho back in the early 1980s. Of course, those were the days before Microsoft was insanely huge, rich, and unstoppable.
"When we set out to design MS-Windows in colour", Gates says in the ad, "we knew that the Tandy 2000 computer would let us turn an extraordinary product into a work of art." Um ... right.