i talk to myself quite a lot in all sorts of situations. whenever I'm working on a math or physics problem, i do most of the thinking outloud. i think too fast if i do it in my head and i lose myself. i try to be quiet, but I'm always mumbling and chewing on a pen when i work, "2 plus.. no... i have to... yeah ok, that looks.. wait.. oh carry the 3... if i factor... then.. mm.. that looks wrong.. oh.. not 2, 4 plus... yeah..." if its a physics problem, my hands are usually trying to conceptualize things as well, its not my fault if we're working beside each other and you get hit.
also, i pretend to talk on my cell phone a lot. i dunno... i just feel more comfortable sometimes if I'm on my phone. so i'll have long convos about whatever "hey sweetie... hm?... i know dear... oh jeeze... well how's karen?... aww...AHH!... no, sorry, i just nearly tripped, I'm walking to class... hehe, i know huh... i love you too... how about tomorrow?... ok dear..." now that i think of it, i really have no reason to do it...
oh, and when i get super upset, i always talk to myself, "its ok abby, it wasn't your fault" "what do you mean it wasn't your fault, of course it is!" "no, no, you just made a mistake, you'll do better next time!" "you always say that" "cause its true, you've been doing better" "barely.. i started out failing, not hard to do better than that" "well its hard for you, you're just not like everyone else" "yah, i suck" "you do not!" "yah, i know... i just don't get why this is so hard for me" "i dunno, just keep trying, that's all you can do" "heh... i think I'm being a bit loud.. people are staring" "hehe, just get out your cell phone..."
other than that though, i don't really talk to myself at all.