Obscene horror? That's my specialty.Pun aside, in a proper darksun campaign halflings and thrikreen eat anything humanoid (well thrikreen might eat anything that moves), even their fallen comrades.
This is about the only scenario, apart form some obscene horror setting, where this situation might come up at my table.
And then it would probably be in the form of some RP lecturing that people are not rations, and the Halfling has to suppress his traditional habits, to be sociable .
Vile imagery, terrible villains, and yes, cannibalism are my stock and trade!