Are you smarter than a 10th grader (such as myself)?

Question

Lets see how much humour you guys can take:

If a stationary bus suddenly starts moving, the passengers leans backwards. Explain.

Hint: Of course, there's a phenomenon at work here. Don't look at it like the average Joe (or me, for that matter) but more like how Newton would have looked at it.

Answer 1

I'm both smarter and funnier than you. Sorry, but you asked.

Answer 2

Yes, I am.

Answer 3

um, acceleration of a free body in space........

Answer 4

every action has an equal and opposite reaction, joe.

Answer 5

How can a stationary bus move?

Answer 6

The bus is rolling down the hill.

Answer 7

O_o they can't have dumbed down science class that much in 3 years... that or I just remember learning tougher stuff.  

Answer 8

I would add that Super Nintendo Chalmers is also sexier than you.

Answer 9

Inertia.