R5: The Bump is back, and it makes disturbing viewing

A few bad bumps, counter bumps and a lot of confusion this week. Here are 3 of the more sickening. A word of warning: once you've seen these they cannot be unseen.

And if you thought that was bad you may not want to watch this one: 

But this is surely the most stomach-churning of them all:

Oh god, you just know they're swingers... 

How did these people ever become a dance troupe?