There is no such thing as 'Common Sense.' Common sense is stuff you learn from a lifetime of experience and as everybody has different experiences throughout their life, there is nothing common about it at all. ie. most people know not to stick a fork in an outlet, but I've seen a kid do it and somebody that comes from a culture with no electricity isn't going to know it. Don't depend on common sense to get you through life, let alone an emergency. Plan on running into things that you know nothing about and proceed with caution.
That is all.
