mie nu-mi place starwars :| f#*c me, right?
My blind friend Jamie has played in many competitive tournaments. He uses a braille typewriter to print text onto his sleeves, so he can differentiate between the cards. His deck rests in one of those clear plastic boxes so that he doesn't knock over his library when drawing a card. Shuffling can be a little cumbersome because the braille text on the sleeves puts bumps and pits onto the normally smooth surfaces.
Anyhow, he's playing at a PTQ and is tutoring through his deck mid-match from a fetchland or some spell. Doesn't matter. Opponent shuffles his deck, and when Jamie puts it back into the clear plastic box the top card catches the side of the box just right and flips over. Opponent can plainly see which card is on top of Jamie's library. Obviously Jamie can't and has no idea there's a problem at all.
Opponent calls a judge. HJ gets called. After some deliberation, they shuffle the library again and the rules require that Jamie gets an infraction.
And that's the story of how a blind man received a warning for Looking at Extra Cards.