Carrie Fisher went off script and called Sharon Horgan a c*** while filming 'Catastrophe'

Of this much, I'm sure: Carrie Fisher was nothing short of a legend. 
That's why it was of little surprise to learn that she was a bit of a rule-breaker during her time filming Catastrophe. 
Sharon Horgan and Rob Delaney — who both write and star in the series — told Mashable during an exclusive screening of Season Four that they were protective over the final script and didn't allow cast members to improvise any lines. Except, of course, for Carrie Fisher. 
Delaney sa