Joan Rivers, who died Thursday at the age of 81, had a successful career that spanned decades and myriad reinventions. [Related: Joan Rivers's Most Outrageous Celeb Insults] But you can't be that ...

For 20 long years, Joan Rivers served one of the most dependably entertaining guests to ever appear on Johnny Carson's iteration of The Tonight Show. First making her appearance in 1965 on the hit ...