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Brain & Nerve Tonic is a potentially addictive tonic for the brain and nerves.
Mr.Burns gave this tonic to his company's softball team to help them play better. However, Ken Griffey, Jr., one of the MLB stars Burns had hired in order to gain an unfair advantage in the championship, found himself addicted to the substance and ended up developing severe, crippling gigantism from abusing it, rendering him unable to play.