By: Addison Wylie Wet Bum features a superb performance by TIFF Rising Star Julia Sarah Stone.  Her helpless presence draws us in, as if we feel the need to lend her a shoulder to cry on.  But, it’s her earnest portrayal of fourteen-year-old outsider Sam that signifies the puzzling phases of fitting in among your peers, and trying to swallow the lump in your throat when you’re singled out for being different. The film that…