Holly: No, they're from Earth. I hope they've got some spare odds and sods on board. We're a bit short on a few supplies.
Lister: Like what?
Holly: Cow's milk. Ran out of that yonks ago. Fresh and dehydrated.
Lister: What kind of milk are we using now?
Holly: Emergency back-up supply. We're on the dog's milk.
(Lister staring at his cup of tea and swallows)
Lister: Dog's milk?!
Holly: Nothing wrong with dog's milk. Full of goodness, full of vitamins, full of marrowbone jelly. Lasts longer than any other type of milk, dog's milk.
Holly: No bugger'll drink it. Plus the advantage of dog's milk is when it goes off it tastes exactly the same as when it's fresh.
Lister: Why didn't you tell me, Holly?!
Holly: What, and spoil your tea?