According to the Myers-Briggs Type Indicator, Sam Winchester is a perfect example of an INFJ. Any fan of Supernatural would agree that Sam is the ultimate idealist who sees the good in everyone, including monsters. Unlike his older brother, Sam is quiet, reserved and often feels misunderstood. In true INFJ fashion, Sam often gets a "hunch" about what to do next, which has saved Sam and Dean's lives countless times (you know, until they die again).