Would you argue with yourself?

I was watching a video on YouTube, and apparently one of the people commenting got into an argument or debate with them self. Whether it was on purpose or just a clever troll I do not know.

But it made me wonder, if I had not known I made that statement if I would argue against, disagree or even think twice.

Maybe split personality would be likely? But I am thinking just an average person (no mental issues or such) who did not realize it was them self who made the statement.

EDIT: I do think if I found something from the past I would. Maybe. I find that is not the same as it being caught in the moment of present time if you will.