Jimmy Fallon was tasked with keeping the boys from 'Stranger Things' in line during an interview on his show, and while they are as boisterous as any of your average 13 to 16-year-old males, they do all have the same guilty pleasure: 'High School Musical'. Who'd've thought it?

The cast of 'Stranger Things' at season two premiereThe cast of 'Stranger Things' at season two premiere

Gaten Matarazzo (Dustin), Finn Wolfhard (Mike), Caleb McLaughlin (Lucas) and Noah Schnapp (Will) happen to be all friends outside of the world of 'Stranger Things', and even spent Halloween night together this year. However, what was meant to be a night of standard horror movies turned into one of singing along to the 2006 Zac Efron movie.

'I got a text from Gaten saying, 'Come downstairs, we're gonna watch a bunch of scary movies'', said Finn on 'The Tonight Show'. 'And I show up and they're watching 'High School Musical'. I'm like, 'That's the scariest movie of all!''

According to Gaten, it was all down to their newest co-star Sadie Sink, who plays Max in the second series of 'Stranger Things'.

'Sadie is a very big fan of 'High School Musical' and so was my sister when she was younger', he explained. 'I would watch them with her and of course the music would always be playing at my house. So Sadie starts to sing it and it opened a flood gate in my brain and all of a sudden I start singing the harmonies. And the correct words!'

He's not the only one who's a secret fan of the movie franchise either. In fact, it was one character in particular who sparked a sporting interest in Finn. 'The reason why I played basketball was because of Zac Efron', he confesses. 'It was Troy Bolton in 'Bet On It' [from 'High School Musical 2'].'

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He also proved to do the best impression of an exasperated Troy, demonstrating his head-grabbing moments followed by a side-step and a dancer's flourish.