All of these are from Undertale (I really liked that game)
"It's a picture of Papyrus flexing in front of a mirror. He is wearing sunglasses. Giant muscular biceps are pasted onto his arms. The biceps are also wearing sunglasses."
"(WHY IS THIS PERSON TRYING TO SELL ME SOMETHING THIS IS A HAMBURGER RESTAURANT I'M JUST TRYING TO SURVIVE)"
[spoiler title="Actually spoilers, albeit ambiguous ones"]
"You felt your sins crawling on your back."
"You tell ASGORE that he's killed you once before. He nods sadly."
"Despite everything, it's still you."
"Greetings. This is Sans. I love my brother very much.
[font=comic sans ms]help im being slandered[/font]"
[/spoiler]
It's not as quotable as, say The Stanley Parable, but it's still got some good ones.