I enjoy pen-and-paper-and-dice roleplaying, but that's a completely different thing - then you're putting yourself in a role that has very little to do with your actual self, and it's all about problem solving in a group. Roleplaying real people, or pretending in front of someone else that I'm talking to a third person who is not present - no, I don't think I'd want to do that. I think I would get so selfconscious and embarrassed that it'd defeat the purpose.