There is no such things like unbreakable password - so we are not looking for them. We are looking for passwords which will be very hard to break, so to be broken it would take extreme high costs within extreme long period of time. This is the first thing. The second one is, that I am to lazy to do the math, and I do not know how many common words are there in English, but I am guessing that entropy of such password is still higher than this first hard to remember password in cartoon.