Big (1988)

In director Penny Marshall's body transference fantasy about a 13 year-old boy in the body of a 30 year-old man:

• the carnival machine scene of 13 year Josh Baskin (David Moscow) wishing to be 'big' ("I wish I were big") at a "Zoltar Speaks" wish-granting machine - and it came true the next morning

Becoming "Big" Overnight
"Zoltar Speaks" Wish-Granting Machine	The Bathroom Mirror - Unrecognizable	"Your Wish is Granted" Card

• the next morning sequence, when Josh (now Tom Hanks as a 30 year-old) suddenly didn't recognize himself in his own bathroom mirror, and found a Zoltar Speaks card in his wallet; he fled from his house when his mother didn't recognize him, and successfully applied for a job at the MacMillan Toy Company (for his child-like intuition, he was ultimately appointed toy tester in charge of Product Development)
• the joyous foot-tapping Heart and Soul and Chopsticks tap dances of Josh with toy company executive boss "Mac" MacMillan (Robert Loggia) on a giant, floor-sized and mounted electronic piano keyboard in the main showroom of an F.A.O. Schwartz toy store
• Josh's reaction to the hors d'oeuvres (miniature corn cobs) at a fancy company-office cocktail party
• Josh's confused sexual relationship with sexy yuppie toy executive Susan Lawrence (Elizabeth Perkins), a top-level co-worker, who had asked to spend the night for a 'sleep-over' in bunk beds; he agreed to share his bunk bed with her - Susan: "I want to spend the night with you." Josh: "Do you mean sleep over?" Susan: "Well... yeah!" Josh (with a guileless reply): "Well, okay... but I get to be on top!"; afterwards, Josh's jumping on a trampoline with Susan (viewed through windows from outside his apartment)
• also the tender, simple and innocent scene in which he gently touched her breast through her bra before kissing her
• the subdued scene of Josh walking around his neighborhood and school, and noticing younger kids, including his friend Billy Kopecki (Jared Rushton) having playful fun
• and in the conclusion, the poignant final shot of Susan seeing Josh, after waving goodbye, transformed into a 13 year-old boy again (with clothes that now didn't fit him) - he ran toward his home, calling out: "Mom?...I missed you all so much"

Josh Waving Goodbye to Susan When She Witnessed His Transformation

• the short epilogue in which Josh and his friend Billy walked down the street discussing playing stick ball (to the instrumental tune of Heart and Soul)