 A very common example of the halo effect is when an observer considers attractiveness a favorable trait, and then assumes that a very attractive person whom he meets is also extremely friendly or helpful, because these traits are also favorable.On the other hand, a logical error fallacy is made when observers make judgments about trait relationships based on correlations they believe make sense logically, instead of forming these connections based on observations of real-life trait relationships.An example of making the logical error would be assuming that a person who is physically strong and muscular is also athletic.