Everyone has a camera, everyone loves dancing. Combine these two things and WA-WHAM! Dancing Flash Mobs.
Here are a couple I’ve seen lately:

H&M Kids Fashion Flash Mob

Some 55 kids, decked out in H&M Kids Fashion, proceed to have a fly hip-hop dance battle in the middle of Union Square, San Francisco.
A great demonstration of the great range of movement (splits abound!) and comfort these clothes provide for kids (as well as sweet hip-hop cred!)

Bondi Beach

This is a routine organised by DJ Dan Murphy and led by famous aussie drag queen, Joyce Maynge. They are part of Rock Your Box - Join up here if you’re keen on getting involved in their next one.

aaaaand, with over 1 million views, this next video goes to show you just can’t beat a fat guy in Speedos doing a dance.