Born with only a vestigial ganglia bundle where a brain would have been, that scar reveals that he had a brain imsplant. Unfortunately, it was the cryogenically preserved brain of Lyndon Baines Johnson and turned out to be even smaller and less functional than the original bundle, probably because – as with nearly ALL Democrats — it had never been used.
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From "Young Frankenstein"
On the glass dome, whose contents Igor has just taken, is printed:
DO NOT USE THIS BRAIN!
"ABNORMAL"