From a long list of the most excruciating old school commercials that painfully integrated rapping comes this winner: The "Perfect Strangers" and "Head of the Class" hip hop promotional collaboration dance and musical extravaganza. I always thought Balki would make a promising rap star, and Larry, of course, is a great hype man. But spectacles like this surely prompted the sitcom stars of today to specifically write "No rapping promo appearances" language into their contracts. So many lost opportunities: