People
So I got two kinds of sandwiches, tuna and turkey. Tuna’s for the fish. Unless you think they’d think that’s cannibalism.
— Lou Solverson

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A gentle, deadpan bit of worry: two sandwich types, one meant for the fish, and then a sudden concern that offering tuna to fish might be some sort of cannibalism. The humour is in taking a silly question seriously, with the speaker checking their own logic aloud.
Context reviewed