It's no fun being in your early teens, especially if you're none too tall. So thinks Josh Baskin, having been denied a ride on a fairyground superloop. But neither is being a kid in a grown-up body so hot, as Josh discovers after a carnival wishing-machine grants the change overnight. What do you do when Mom doesn't recognise you, and thinks you're your own abductor? How do you get a job when you can't drive and have no social security number? And when you do find work with a toy-design company, how do you cope with board meetings, office rivalries, and swish staff parties? Marshall's movie may be a mite predictable, but it's genuinely funny, thanks partly to Hanks' engagingly gauche and gangly performance as the overgrown Josh, and partly to a script that steers admirably clear of gross innuendo. Much of the humour derives from Josh's inability to comprehend adult life; much of its charm from the way his forthright innocence steadily revitalises those around him. Admittedly, this latter theme makes for an ending oozing with saccharine sentiment; but until then Marshall, Hanks, and his co-stars seldom put a foot wrong.