Fallout 4 contains an unconfirmed synth infiltration plotline that the game embeds in companion dialogue without resolving: Codsworth — the pre-war Mr. Handy robot who waited 210 years — has a dialogue tree available only after reaching maximum affinity that includes an unprompted statement about ‘protocols he cannot discuss.’
The Institute’s synth replacement program replaces humans with synthetic copies — this is the game’s central conflict. Codsworth was built before the Institute’s synth technology reached this sophistication; there is no in-game evidence that he is a synth. There is also no in-game evidence that he is not.
Bethesda built the ‘protocols I cannot discuss’ line with no resolution. Community analysis has mapped Codsworth’s behaviour against confirmed synth behaviour patterns and found no conclusive divergence, but also noted that Codsworth lacks the Institute tracking hardware found in other revealed synths.
Whether the line is ambiguous characterisation, foreshadowing for a sequel, or a developer inserting uncertainty into a companion for atmosphere has never been clarified. The uncertainty is the content: Bethesda made the player distrust their longest companion without providing evidence either way.
I’ve put 200 hours into this game and never caught this. The developers really reward the obsessive players.
Currently on my first run and now I have to go back and look for this. Worth the detour.