They say not to judge a book by its cover,i don't really believe that!the cover of a book could be either catchy or dull which kind of affects whether i pick it up or walk right pass it.
People on the other hand go both ways,you cant completely judge a person by their first impression,you never know what the circumstances were when you met.They could be acting just like themselves or they could be acting under the affect of anger or grief or whatever else they were feeling that may have altered their behavior.
But still,first impressions play a major role in determining the way you feel about a person,the rest is then achieved once you get to know them.Meeting someone good-natured and cheerful really leaves an impact on oneself.
And you never know sometimes something as simple as a smile or a kind word could be the key to opening a simple heart....