When nine-year-old Caine Monroy spent his summer vacation building an elaborate arcade out of cardboard boxes found in his father's used auto parts store, it was the sort of project that typically would have been remained a cute tale told at family gatherings. But then filmmaker Nirvan Mullick stopped by the east Los Angeles shop. He was looking for a door handle for his car, but was captivated by the world Caine had created -- and quickly became the first customer of Caine's arcade. Impressed with the elaborate setup, Mullick got permission from Caine's father to make a short documentary...