Back to the Future 2, commonly recognised as the weakest film in the trilogy, nevertheless has many good things going for it - hoverboards, for instance, and the unalloyed weirdness of seeing Michael J Fox in drag playing his own daughter.
There's also the imaginative futuristic fashions - a cavalcade of lurid nonsense that the film's makers imagined people would be wearing in the future year 2015.
Among the wardrobe items in the film, none are as fondly remembered - and desired - as the Nike Mags, the self-lacing trainers worn by Marty McFly's idiot teenage son.
And now they exist in the real world - and you can be in with a chance to win a pair by paying $10 to enter a prize draw.