In 1967 , he appeared on the prime time national TV show To Tell The Truth .
In 1967 , he defeated the panel by convincing them that the three ventriloquial voices he produced were coming from the two impostors .
In 1967 , he appeared on the prime time national TV show To Tell The Truth and defeated the panel by convincing them that the three ventriloquial voices he produced were coming from the two impostors .