Deus Ex: "Let me drop something, hehe, hold on."
Half-Life 2: "Gordon!"
Fallout 3: "Bleeeeurgh!" (As well as anything said by No-Bark)
Fallout 1&2: "Moo, moo I say."
"Pipe valve."
"Big head."
"Big totem pole."
"Simple pottery."
All from Sanitarium. The lines are sort of an in-joke with my friends.