Who gave You the authority to put Me in charge ?

Above is one of the funniest lines I heard in my life -

From the movie Madagascar -2
(The plane, Air Penguin, has crash landed and the penguins are looking at a clipboard.
Private is the penguin captain. Alex is the lion, the movie's hero)

Private : (turning to Alex) You! Pretty boy! Why don't you and your friends dig a tree, maybe find water.
Alex : Hold on, hold on a second. Who made you... king of the plane wreck?
Private : 'Scuse me? Fine! You can be in charge! You fix the plane!
Alex : Who gives you the authority to put me in charge?
Private : Okay then... I'll remain in charge.
Alex : Yeah, that's right! You will remain in charge.