Doing It for the Art: The team at Naughty Dog could be called insane for the amount of work they put into these games. From doing motion capture and dialogue recording at the same time to squeezing every last bit of power out of the PS3's Cell Processor, the effort they go through to produce this amazing experience goes far, far beyond what is required to make these games a success. They don't just go the extra mile, they pave the road for everybody else.
Throw It In!: Many of Drake's one-liners were improvised, including:
"I will kick you to sleep!" in Uncharted 1.
"Aw, kitty got wet!" in Uncharted 2. It was originally thought of by Nolan North's son while playing Wii Tennis, which leads to it being one-upped with this random line during multiplayer. Referenced in Uncharted 3: "Aw, what's the matter? Kitty don't like getting wet?"
During a recording session for Uncharted 3, Nolan North watched a scene of Sully crossing a beam very wobbly, and immediately shouted "What are you, drunk?!"; to which Sully replied, "Maybe..."