Just in your head? Heck, I do it out loud all the time! When I'm alone that is. Or when I think I'm alone. When it turns out I'm not alone, it used to be embarrassing, but these days I just don't give a crap and think it's funny.
'Course, others think I'm off my rocker when they see and hear it, but that's their problem. I don't care. Let 'em think I'm senile! 
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...