I've had this conversation several times in my life, where I use a second-person pronoun when actually using the third-person:
"If you were dressed up as a clown at night holding black balloons, I would be suspicious too!"
"I would never dress like a clown."
Or exempting the 'if' from the sentence:
"You choose to join the organization, then you're responsible for that organization's beliefs and policies."
"I am not a member of that organization"
It's actually hard to come up with examples for this off the top of my head. The point is that I use 'you' as a third person pronoun because it's hypothetical, but it's taken literally, and I want to be able to tell the person I'm talking to what the name of the grammatical construct is so that he or she doesn't misunderstand me.