I'm rather surprised (and saddened) at how many DMs force their Players to be sensitive to subtleties in the DM's acting ability. I find this highly unfair.
Personally, as a Player, I don't normally notice subtlety in any situation. But my 1st-level paladin has +7 in Sense Motive. I also am not all that great with public speaking, but my 1st-level paladin has +11 in Diplomacy. [I took the Skill Focus (Diplomacy) and Negotiator feats.] If I had a DM that handled all my PC's social interactions off my Real Life ability to speak elloquently and note small subtlety, I'd never play a social character -- I'd stick to hack and slash feats.
When I DM, and the PCs are interacting with a bluffing NPC, I roll the NPC's Bluff check vs. the PCs' Take 10 Sense Motive check. If the Players actively call for a Sense Motive, I let them roll vs. the NPC's Take 10 Bluff check. Either way, the in-game results do not rely on our Real Life social abilities.
Now, back to the opening post:
PC: "Do you know where John is?"
NPC: "I haven't seen John today." [NPC knows where John is, but doesn't want to say.]
Does the PC get a SM check versus the NPC's Bluff check? Or does the Player have to specificaly call for a SM check?
What say you to this?
How about when the question and answer are less straight forward, but the meaning is clearly understandable?
PC: "Where is John?"
NPC: "I haven't seen him today."
PC: "Did John make it home OK?"
NPC: "I didn't run into any problems." [NPC left John on the park bench where he fell asleep.]
And this?
Do you consider the above as Bluffs? If so, does the PC get a Sense Motive check automatically (even if secretly made by the DM), or does the PC have to call for a check?
For me, I consider any kind of misdirection or midleading a Bluff. Whether the Bluff was blatant or subtle, or a twist on the full truth, or a half-truth, or a non-answer. And I don't rely on the Players' abilities to catch me being subtle (which I couldn't act out anyway).
Quasqueton