When you learn new words by reading and not so much by hearing them, it's easy to mispronounce them in your head. Then later, if you hear the word spoken, you might not even recognize it. It happens to everyone, or at least everyone who reads a lot when they are young. John Green sets the record straight on a long list of commonly mispronounced words. -via mental_floss
Examples
Twix have caramel, I think care-uh-mel
caramel apple, I think car-uh-mull (like a vehicle)
caramelize, similar car-mull-ize
Another word is Caribbean I either say Ca-rib-e-an or Cari-be-an depending on context
maybe I'm just weird
"You reap what you sew", "All intensive purposes", etc.