I’m not going to trust a brain surgeon with OJT
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Actually brain surgery and most others is mostly OJT
There's a great line from "The Adventures of Buckaroo Banzai" that goes something like this:
A bunch of doctors are operating on a guy's brain when one starts probing with his finger. The Top Man says, "No, no, no! Don't touch that! You don't know what it may be connected to!"