It was f'n hilarious.
Stewie: (Kicks other kid in the nuts) (nuts) "That's right! Cry! Cry like Sauron when he lost his contact lens!"
[Flash to the Eye of Sauron in LOTK]
<FLASH LOTK in Sauron of eye the to>
Sauron (Eye is looking around in a panic): "Has anybody seen my lens?! Anybody?! Hey, watch where you're stepping! Oh man, I am so screwed!"
Hahahahahahahahahahahah! (rlaugh)