267
Homer Simpson irl
(i.imgur.com)
Man found missing 90% of his brain defies scientific understanding - most of his skull is filled with water:
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(07)61127-1/fulltext
He's not 100% normal, you just haven't experienced the things he cannot process properly or at all, which is likely a lot of higher reasoning... They just don't affect his day to day, which gives us clues that day to day functioning is very low level and likely mostly autonomous.
Eh, college is hard and so was his sport. Sure, it's not an exhaustive battery of testing but I'm confident to say he's a normal dude.