Rambo's Laws of Motion
Rambo's First Law:
"An object at rest stays at rest until you shoot it with an explodo arrow."
Rambo's Second Law:
"Force equals mass times acceleration times how loudly you scream as you fire your weapon."
(NOTE: To see Rambo's Second Law in action, fast forward to 1:13 of the clip)
Rambo's Third Law:
"To every action there is an equal and opposite reaction. If you shoot down someone's helicopter and kill them, they will come back to life and shoot down your helicopter and kill you. WITH A BAZOOKA."
There was going to be a fourth law, but Rambo shot it with an explodo arrow.