Dan Ridley-Ellis made this sweet video of happy children chasing bubbles at an outdoor fair in Edinburgh, Scotland. The slow motion works particularly well, as the ecstatic children seem to float just as weightlessly as the bubbles. The melancholy music is the old barbershop quartet standard, "I'm Forever Blowing Bubbles."

I'm forever blowing bubbles, Pretty bubbles in the air, They fly so high, nearly reach the sky, Then like my dreams they fade and die.

What is it about slow-motion film that makes happy moments seem bittersweet? Is it because it reminds us that these moments are fleeting? Or is it just because Hollywood has trained us to think of slow motion as foreboding and ominous? I'll leave you to ponder that as you watch Dan's delightful video.