Joan tends to swear quite a bit when she's joking around. I don't know why she does that, but in her case it's sort of cute...although you don't always expect it. She seems to bounce back and forth between absolutely queenly dignity and teen-like rebellious acting out.

Of course, when she quotes small talk with Bob Dylan she's GOT to swear if she is going to quote it accurately.

Ever heard her mimic his singing style in concert? She can't manage the gravelly roughness, but she gets the nasal sneer down fine. Pretty funny to hear.

She does a hilarious imitation of Mary Travers too, singing "500 Miles".