Cosmo kramer, a popular character on the seinfeld television show, displayed unusual mannerisms, had a very strange haircut, and engaged in weird behaviors like bathing in butter and pretending to host a television talk show in his apartment. these eccentricities could be common for someone with a personality disorder.

These eccentricities could be common for someone with a "Schizotypal" personality disorder.  

Explanation:

Individuals who suffer from schizotypal personality disorder are frequently portrayed as odd or eccentric, these individual are not comfortable with relationships which are close to them because they are unable to understand that how they can manage relationships and their behavior.