RIMMER: Lister, don't you ever stop and wonder: why are we here? What's the grand purpose?
LISTER: Why does it have to be such a big deal? Why can't it be like, like, human beings are a planetary disease? Like the Earth's got German measles or facial herpes, right? And that's why all of the other planets give us such a wide berth. It's like, "Oh, don't go near Earth! It's got human beings on it, they're contagious!"
RIMMER: So you're saying, Lister, you're an intergalactic, pus-filled cold sore! At last, Lister, we agree on something.
-- Red Dwarf, "Waiting For God"