While playing Fable 3 (which has an insane amount of references), I realized that there has never been a reference to Manbearpig in a game (or at least not one that I played), and was thinking: wouldn't it be amazing to see/fight/have a side quest for/with him in NV DLC, or FO4 as a hidden Easter egg? Considering he's a mutated thing, it would actually fit well in the FO universe. Maybe its just me, but I LOVE references, especially in games (something else NV was lacking compared to 3).