analog

I have to strongly disagree.

If for nothing else but my own personal entertainment, I will somewhat frequently pretend to have another personality entirely. I have a "southern gentleman" personality, complete with voice and mannerisms (think along the lines of "Gone with the Wind" southern gentleman, with a slow drawl. If you've ever seen The Saint, with Val Kilmer, it's sort of modelled after his "southern gentleman" disguise).

I have an extreme OCD personality that has a tic (neck twitch) whenever someone says "the" (or any other word I might pick at the moment)... his voice is pretty much always a North Dakota/Minnesota accent... I have no idea why, but when I do that personality, that's the voice that seems to fit.

There's "guy with crappy depth perception"... not really a personality, but I completely unfocus my eyes so it effectively looks like i'm blind or can't focus on anything, and then when I reach out to take or give things, it's always way off and/or in the wrong general direction.

I also have several others that are more subtle or less developed, but they're fun.

Ok- ever notice on news shows when they're doing a live broadcast from somewhere, "via satellite", and the person on the other end is always standing there for a couple of seconds after the first person finishes speaking, because of the delay? Sometimes I do that... continue to stand there with the same look on my face, give it several seconds, and then finally answer as though I was working on some sort of delay. That's a fun one, because people tend to get weirded out pretty quickly, and yet it's so innocent.

Oh, and of course I adopt a professional persona while at work which is just an extension of my natural personality. Maybe that's closer to what you were talking about.