The movie: Big (1988)
The player(s): Tom Hanks
To be fair, Josh Baskin (Hanks) has the right to act like a 12-year-old because he is one. But when his wish to be bigger comes true, he ends up in the body of a 30-year-old who somehow finds himself in an executive role at a big-time toy company. Hence the sweet loft adorned with blow-up toys (no, not that kind), pinball machines and one kick-ass trampoline.