For whatever reason there as some words that when I read them I pronounce them in my head incorrectly. They are:
Smoking: On signs I always read this as smorking. I know why too -Engrish.com. Sometimes I have to make a conscious effort to not say smorking instead of smoking when I talk. The strange thing is that I only pronounce this word wrong when it is associated with cigarette smorking.
Parking: Along with smoking parking gets transofrmed in my head to porking (thanks engrish). I don't have as much problems with this word, however I do say this one outloud sometimes, just for personal irony.
Elevator: My strangest mental mispronouciation is elevator which I read as elevatop. I know why I do this; because the Games Workshop store in Manhattan has a sign up that says ELEVATOR but someone took off one of R's legs to change it into a P. Then whenever I would go to the store I would read it and laugh about it (it almost describes what an elevator does better than the actual word). But something happened, and now every time I see a sign for an elevator I read it as elevatop.
I am sure that there are other words that I read incorrectly, but those are the main three.