I really need to be careful about talking to myself in a crowded store. Especially since I tend to have discussions/debates/arguments with myself (comparing Pros & Cons in a decision or situation etc...). I also tend to be very animated when I talk. So just imagine Big Bad me walking down the aisle of a store pushing a shopping cart and having a very involved conversation with himself.
Its not that I think there's someone else there. I just end up making statements and rebutting them and just really talking to myself out loud. I've caught myself doing it often enough and I think its amusing, but the consesnus seems to be that its a little creepy
No, I have neve done that at VI ;-p