What you talking about willis?
Gary Coleman (child actor, born February 8, 1968).
"Wha' chu talkin' bout, Willis?" was the frequent exclamation of
younger brother Arnold Jackson to older brother Willis Jackson on
the TV series "Diff'rent Strokes" (1978 to 1986). Willis was played
by Todd Bridges (born May 27, 1965).
5/28/10 R.I.P Gary Coleman