In the episode "The Big Switch-a-Roo", when Diddy Kong realizes that Donkey Kong's brain is inside the body of Bluster Kong's robot, they both sing "Metal Head".
DIDDY:
Is there something you should tell me, big buddy?
Are you aware of the glare from the sun shining off of your hair?
DK:
I don't know what you mean, it's just a healthy sheen.
I must admit I feel a little strange,
But I've never felt better, I'm stronger than ever,
Can't you see nothing's changed?
DIDDY:
I don't know how to tell you, metal buddy,
But you look just like a solar-powered turbo-charged washing machine.
DK:
I'm not light on my feet, now I clank and I squeak,
But my voice is the same when I speak.
My hands look like aluminum foil.
Does this mean that I need a tune-up and a change of oil?
I'm a metal head, a metal head, a metal head, a metal head
I'm a metal head, a metal head, a metal head, a METAL HEAD!