Well I have a strange habit of pronouncing words I haven't heard aloud or didn't make the connection(even though I know they both meant the same thing) in VERY odd ways sometime even for clear words like gratuitous(or gra-chu-us during the development of Gratuitous Space Battles).
Here are some of the ones I can remember:
Ankh(A-nuk)(in this case I knew what word it was, it just always came out like that... until that day I said it in history -_-)
whore(only because I was being goofy and wanted to try and work the w in some how, also during school but only one of my friends could hear me luckily)
There are a bunch of other ones I can't think of, but I hear almost all of them before saying it to someone so I rarely get caught saying the wrong thing. =-)