Some surgeons are in the OR. There is a missile on the operating table.
Missiles can't be operated on like humans.
Why is a missile there?
Damn it, I'm a brain surgeon, not a rocket scientist!
scene: an operating room description: Some surgeons are in the OR. There is a missile on the operating table. uncanny: Missiles can't be operated on like humans. entities: Surgery, Rocket. caption: Damn it, I'm a brain surgeon, not a rocket scientist!
A play on the term "rocket scientist" --- usually, this is used as a figurative expression to mean someone smart/qualified broadly, so to be "not" a rocket scientist would mean not smart or qualified. However, here, the person is actually quite smart and qualified --- they are a brain surgeon, and the expertise they are being called to use is literal rocket surgery. A brain surgeon is not a literal rocket scientist that can fix a rocket.