COUBS

Never heard of these (and didn't see a COUB thread yet), but they seem to be short 10 sec mixed vid clips, I've not found a way to embed them yet though so this thread may die fast due to that
Explore Coub

here are some samples...

slowly running boobs xD

Let's shake Megan's boobs

http://coub.com/view/80t8y

Shake Sexy Boobs

http://coub.com/view/7wyps

Tried my hand at making one...

Benny Hill Slap