Do we know ourselves??

I wonder how many of us know how we would react to a particular situation. Given a hypothetical situation we can always say what we would do if we ever had to actually face that situation, but how many of us actually end up making the correct prediction about our own behaviour. Its strange how those who can predict absolutely correctly about other, end up making the wrong predictions about themselves. In all these years I've come across so many individuals who comment adversely on how some other person behave given a particular situation and then end up doing something similar themselves, being blissfully unaware of it too! I wonder how many times I've failed similarly. Its strange how easily we can see the mistakes other people make, but are totally unaware of it as far as our own self is concerned.