As a by product of the 70's and 80`s, Diff'rent Strokes is a landmark of television history. Gary Coleman's catchphrase "What'choo talkin' 'bout, Willis?"was for a while even a part of daily vernacular. Even in my native Spanish were he said "De qué hablas Willis?"
I have just learned of his demise at the age of 42. Rest in Peace Gary Coleman.
Here's a wikipedia bio if anybody want's to ready further: