Ossify: cause to become hard and bony; petrify. As in, "Little Ollie didn't believe his mother when she said his face might ossify if he kept contorting it in an unnatural and ugly manner. Who's laughing now, Ollie?"
My options for the word ossify were either to draw a gnarled old witchy woman (see example A) or to draw little Ollie with his face stuck like this for all eternity. Do they teach this in mom school? I'm pretty sure everyone I know has been told this by their mother (or someone else's mother) at some point during their childhood. I should also mention that Scott's reaction to little Ollie was very visceral—he recoiled in disgust and said, "Ugh! I can see all the way to his BRAIN!" Mission accomplished.