Bluff and Disguise

[Razanir]

If you were good enough at them, could you potentially disguise yourself as someone then convince that person that they're actually the fake?

[Geddy2112]

"Note that some lies are so improbable that it is impossible to convince anyone that they are true"-from the pathfinder rules.

So without magic, no. Now convince other people that you are that person, sure.

[Morcleon]

If you were good enough at them, could you potentially disguise yourself as someone then convince that person that they're actually the fake?

If you're good enough, sure. (http://www.d20srd.org/srd/epic/skills.htm#bluff) You'd have to make up some story about how they had their memories implanted or something, but it should work. :smallbiggrin:

[Segev]

Short answer: "Not without magic."

Slightly longer answer: "Such a thing would require a lot more in-depth social and mental-influence mechanics than D&D supports."

Gaslighting somebody until their personality and sense of self is so undermined that they doubt their own identity requires a lot more mechanical support for manipulating a lot more details of the human psyche than D&D is designed to handle. Exalted gives it a good try, but still it's easier to turn to magic (not because magic is more powerful - which would make sense in that setting - but because the mechanics for altering belief are better-written in their exception-based Charms than in their base social system).

[ShaneMRoth]

If you were good enough at them, could you potentially disguise yourself as someone then convince that person that they're actually the fake?

If your DM is an idiot, yes.

[Gabrosin]

If you were good enough at them, could you potentially disguise yourself as someone then convince that person that they're actually the fake?

Definitely. But to get it past a DM, I suggest you come up with a plausible lie to recite to them in character, rather than relying on the dice to do the work for you. You'll also have to define what you mean by "fake" in this context. It's pretty hard to convince someone they don't exist... but to convince them to doubt their own memories, that they are really someone else? People's memories are actually pretty easy to influence if you know what you're doing.