TV journalists take note: if Joan Rivers doesn't like your questions, she'll tell you off and leave. That's what happened when Joan, 81, sat down for a chat with CNN anchor Fredricka Whitfield on Saturday. The segment kicked off on a light note, with Fredricka highlighting Joan's storied career and accomplishments. Then Fredricka mentioned Joan's "mean" comments about celebrities on E!'s Fashion Police, and the conversation soon went off the rails. Watch the video above to hear the tense exchange, which Fredricka initially thought was all a joke.