Gary and his famous catchphrase became the most popular fixture of TV’s “Diff’rent Strokes“.
The origins of the famous catchphrase What Are You Talking About Willis?, sometimes written as ‘Whatchu Talkin Bout Willis?’ or ‘Whatchoo Talkin’ Bout Willis?,’ was explained in a television interview by Todd Bridges, who played Willis Jackson on the show.
“It was a typo in the script and it was supposed to read ‘What Are You Talking About Willis?’ Instead, it apparently read ‘Whatchoo talkin bout Willis?'”
And the rest is television history — Gary made the phrase “his own”. See below!