As a college student who takes a online courses -- and has a ridiculously affectionate (needy) cat -- I can totally understand the reasoning behind that job posting.
This happened on an episode of House M.D. I think the baby needed surgery and they put the baby back to ripen when done. The baby grabbed Dr. House's finger. It looked real-maybe it was- and even grumpy Greg's hard shell was momentarily softened.
I've seen that but only from an aerobatic airplane with smoke generators on the wingtips. I can't think of any natural process that would cause that formation.
Some of the New Zealand extras playing Orcs in The Lord of the Rings started doing this sort of dance as a time-killer, and a version ended up appearing on-screen during the Battle of Helm's Deep.
I can't think of any natural process that would cause that formation.