He reportedly claimed to have read Knuth's The Art of Computer Programming, which would certainly require some serious CS and mathematics chops to comprehend.
"You're full of shit," Knuth responded.
http://folklore.org/StoryView.py?story=Close_Encounters_of_t...
[edited to add: I should of course just have called it "unknuth", but my pun-sense wasn't quick enough on the mark.]