Complex human Perhaps, human beings are the most complex animal! You always can't figure out what a person is thinking or what he want to do, especially that guys which hide deeply. smoetimes friends surrounding talk with me and said that if doesn't a person has something need you help, who like to keep smileing always to somebody! Such as a roommate during my university, he said the same word to me, for him, if you meet him on the street or some place else and you not say hello first, I can guarantee that he also will not say hello to you, Even if past head to head with you! and actually I tested that before.