:WHAT!: A line of dialogue or one outright scene.
e.g. "Rick, Daryl, Carl and Michonne go into the container, and only find half of the crew in the container, with one of them missing limbs".
Example 2, Gareth: "They'll be a good meal", "It's time to eat" or something sinister.
If they wanted to fully establish that they were cannibals they would have done so, but they didn't. The whole episode intentionally played on the viewers suspecting that the residents of Terminus were cannibals and that they had possibly eaten the first group that entered. That's why they held off showing them until the very end and bombarded the viewer with imagery of possible cannibal activity through meat, bones and then items that the group owned. When Rick, Quarl, Daryl and Michonne go into the cargo container you're expecting the worst, however it instead it ends in a sort of happy reunion, the characters that they alluded to being eaten are fine and healthy.