If there's anything more boring than watching paint dry is to listen to other people's dreams. And possibly the only thing more boring than that is to read about other people's dreams. So let me tell you about this dream I had last night...
Of course I'm not going to do that. But let's stick to the topic of dreams. Of course you've had dreams about acquaintances or even total strangers before, and possibly dreams that don't make much sense. A great many things could be said about nonsense dreams, and Freud would have a blast poring over them, but let's not go there. Rather, instead of addressing the causes and implications of preposterous dreams, let's talk of the consequences.
But Shark, you charismatic stallion, what consequences could silly little ravings of one's subounscious have to a sensible person?
Well, you might not want to call me a charismatic stallion, or Mr. Ben "Yahtzee" Croshaw might take offence that you're imitating his fans, rather than understand that such imitation is really the highest form of homage... to his fans... from my fans. Nonsensical dreams, then.
Consequences, then. To address your question, I don't think there might realistically be any consequences, but what if any time you dreamt of someone, that person had the same dream from their prespective? Of course limitations must exist to this hypotheseis, such as it can only be verified if both people are asleep and in REM stage (Rapid Eye Movement, naturally, not asleep on stage at an REM concert) at the same time. Wouldn't that be neat? Some Hawaiian would have woken up this morning in a right confusion, then.
Pax vobiscum atque vale.
ArabianShark would like to remind you that, for a working graph cut algorithm, one should assign costs to edges with a formula along the lines of e^(-k*d), where k is a threshold constant greater than 1 and d is a propperly computed distance value between the color values of the nodes.