The Toronto Star found this video of a 13-year-old Curry (number 12) leading the Queensway Christian College Saints Grade 7 and 8 boys basketball team up against the school staff—and his father—during the 2001-02 school year. Not surprisingly, the team went undefeated that year:

"He was this tiny little guy, but when we put him on the court he was just unbelievable. He was scoring 40 points, 50 points a game, no problem," gushed James Lackey, the history teacher who coached the Saints during their out-of-nowhere undefeated season of 2001-02. "No one even came close to us that year."

[Toronto Star]

h/t Chris