Now the much-loved scene is about to be recreated with the original Mr MacMillan from the UK Premier of 1988 classic Big – 15 years after his debut.

Renfrew teenager Chris Brown, 19, has sunk almost 10 years of savings into producing his very own theatre version of the iconic film.

And he is “ecstatic” that the original actor of the first stage version, Robert Fyfe, is to star in his revival of the show.

“I am really excited about this news and Robert is also just as excited to get back on the giant piano for a second time round,” Chris beamed.

“Before I was getting extremely worried as there is only three months until the show opens and I had still not cast the role of Mr MacMillan, the toyshop owner.

“Despite many casting calls and various emails to amateur societies, I could not find someone suitable for the role.

“That was until I came across Robert Fyfe, the original Mr MacMillan from the UK Premier of BIG back in 1999, who has agreed to play the role of Mr MacMillan in my new revival of the show.” The musical will take centre stage at the New Athenaeum Theatre of the Royal Conservatoire of Scotland in Glasgow’s city centre in June 2014.

Ambitious HND theatre student Chris produced the entire show using his his savings – with most of the cash invested into creating an identical version of the movie’s famous light-up piano.

Chris told The Gazette: “My favourite scene is the piano scene and I wanted to recreate that as best as I could.

“Luckily a lot of people in my family are joiners and they helped me build it.

“It’s basically a replica of the real thing – my dad and I dance on it all the time.

“The news that the original Mr MacMillan, who dances with Tom Hanks on the piano in the film, wanted to be in my show was absolutely amazing.

“He’s a fantastic actor and basically saved the day when it came to the musical.” Big the Musical will be a stage adaptation of the fantasy-comedy film about a boy who makes a wish to be ‘big’ at a magic wish machine, only to wake up the next morning in an adult body.

By chance, Josh meets the MacMillan Toy Company owner, Mr MacMillan, checking out the products at FAO Schwarz and impresses him with his happy-go-lucky childlike enthusiasm.

They end up playing duets together on a foot-operated electronic keyboard, performing Heart and Soul and Chopsticks. This earns Josh a promotion to a dream job: testing toys all day long and getting paid for it.

Chris, a former pupil at Mearns Castle High School, was inspired to make his own adaption after watching the movie when he was working as a children’s entertainer at a campsite in America.

He said: “I saw Big for the first time last year and started to think how great it would be to do a musical version.

“Tom Hanks has always been my favourite actor, so I just went ahead and applied for a theatre license with the Royal Conservatoire of Scotland.

“Initially I had emailed them and they agreed. When they eventually found out how young I was, they were pretty shocked.” But before that, the impresario had to cast 60 roles – a difficult task considering he was flooded with hundreds of applications.

He continued: “I never expected to get such an amazing response but I’m absolutely chuffed with how it has went so far.

“I’m going to write to Tom Hanks to let him know about it. It would be a dream come true if he wrote back.”