Different kinds of superstitions exist based on things in nature,charm,objects,colors,events,and so on.(2) One superstition that many people observe in one way or another is the superstition that number 13 is unlucky.(3)Hotels avoid a thirteenth floor and many of them even avoid a room 13.(4) Friday the thirteenth is regarded as a day filled with danger.(5)Some experts say that 13 was unpopular from the time man learned to count. (6)He could count up to 12 using his ten fingers and two feet.(7) Anything beyond that-the number 13-was unkown and frightening.(8)It was best left alone!