You know how it is – you're watching a film, when suddenly, out of nowhere, the characters burst into song. Fine when it's a musical – much more surprising when it's not. Here's some of the best of these moments – but can you think of any others? Share them in the comment thread below..
500 Days of Summer
Joseph Gordon Levitt's adorable Tom finally spends the night with the beautiful and quirky Summer and launches into a cheery, dance-filled rendition of You Make My Dreams Come True by Hall and Oates. Almost as elating as losing your virginity, this happy, colourful scene is easily one of the highlights of the film. Sadly the next scene is not nearly so cheerful…
Reading on mobile? Watch the clip on YouTube
Taking a break from the hyper-macho guy talk, the Channel 4