I saw this movie once when I was thirteen or so and clearly it made an impression on me as I discovered with this re-watching. Nearly every scene was seared onto my brain from that one viewing. This holds up remarkably well and has excellent performances by all the boys, but especially, I thought, Will Wheaton.
poster from: http://www.impawards.com/1986/stand_by_me.html
I think my favorite thing about this poster is the folds in it.