"Now do Spock!"

-- One evil alien to another, who had just impersonated Abraham Lincoln in order to fool and ambush Capt. Kirk (original series). (Spock was elsewhere. Kirk couldn’t believe the Lincoln impersonation, so the alien repeated it, and then his companion said the line quoted above, and the alien did a perfect Spock voice, to tauntingly showing him how easy it was.)

Now do Picasso! Now do Michelangelo! etc! Very fun and fascinating!