I think in the book The Absolutely True Diary of a Part-Time Indian by Sherman Alexie. the main character Arnold Sprits (aka JR.) is the way he is because he thinks people think he's dumb because he has a lisp and studiers and he has some physical appericences that might draw peoples eyes to him because he has think glasses, not olny that he was born with water in his brain.

              (on page 1) in the book it sayes that he has water on the brain which makes him have seagesand, he calles his self dumb for that and he studders so no one really could understand him so he tries he best to speek but sometimes he failes. hes the only person that realy puts his self down couse of that its like hes bulling him self with out any help.

              being tha he has water in his brain means that he has seages ALOTTTTT