What daytime host gave a brand new Pontiac GSix to all 276 members of her studio audience in 2004 only to leave them with hefty 7000 tax bills too?

What daytime host gave a brand new Pontiac GSix to all 276 members of her studio audience in 2004 only to leave them with hefty 7000 tax bills too?
The Big "O", Oprah Winfrey.