Ever phoned through to an IT help desk and gone through the same old routine a hundred times? Turn it on and off, check everything's plugged in, and clear your cache. It's a stock answer, and both you and the person you're speaking to are both probably rolling your eyes as you go through the motions. Well, now you can feel smarter than them, because they probably pronounced "cache" wrong.
It's the second 'c' that does it, it just makes the word look like there should be more going on with the sound then there actually is. You do not pronounce it "catch", like you've just caught a ball. Nor does it rhyme with "sashay", you fabulous thing. Spoken correctly, it sounds exactly like "cash" as in money. We bet you feel a bit better for knowing this now!