Snowpiercer2013

Mason:
[as sushi is prepared] You people are very lucky. This is only served twice in a year. In January and July.

Tanya:
Why? Not enough fish?

Mason:
Oh, enough is not the criterion. Balance. You see, this aquarium is a closed ecological system. And, um, the number of individual units must be very closely, precisely controlled. In order to maintain the proper sustainable balance.

[as they eat, Curtis knocks Mason's chopsticks out of her hands and offers a protein block]

Curtis:
No. You eat this. You know what that's made of? Dig in.