Hi Abbii
I have to say I am not at all Superstitious. I've always been led to believe a black cat is 'bad-news'. My Father in Law and Mother in Law are a darn nuisance for avoiding crossing paths with black cats! I think it goes back to black cats being a 'witch's familiar'; although my guess is that it may well go further back than that.
The best thing to do is to expect a happy day every day! OK, so we all have our bad days but it sure helps make the happy days to be even happier if we are anticipating them ... rather than watching out for black cats ;-)
~F~