A knife to carry around during rough times

These days, I have been watching a lot of survival tactics at Youtube since there are beliefs that the world is going to end in 2012.  I don’t like to believe in it, but just in case, the world change by that time, it would be better if I am fully prepared before it comes.  The first thing that I notice about the videos that I had watched on Youtube is that almost all of that need tactical knife which can be used on almost anything.

Of course, we could also use some folding pocket knife or fixed blade knife during those time.  All that we need is one of those knives and some knowledge on surviving during rough times.