Obvious? No, I don't think so.

I find this clip very, very interesting. We are all so used to the everyday phenomenon of gravity, it is all around us, all the time. We sit, we stand up, we walk, we lift things... and all the time there is this strong force pulling everything DOWN that we have to fight.You know? Apples fall to the ground. We have big, bulky muscles in our legs working hard to push us up everytime we rise up from a chair...  Gravity.

We are so used to all these things that we hardly ever think about it. We are so used to the force of gravity that we don't even SEE it happening.

Now, that is exactly what an animation student has to learn to see and understand. Gravity in action. And that is why I love this clip. Suddenly you see how STRONG gravity really is. It's pulling that man across the room! And you see how the acceleration of a falling object works - just look at that cup falling off the table. It's amazing, isnt it?

Actually this would be a really fun clip to use as a reference for an animation exercise...  :)

YouTube - Drunk tilted Room Sketch