Well it took me three days searching but I found the clip... it wasn't when Sybil's alter "Peggy" showed up but when Sybil was talking to her father in the restaurant. One of her angry selves emerged (didn't find out who) and she got up from the table and growled "Urrrrrrrrrrrrrrrrrrrr! URRRRRRRRRRRRRRRRRRRRR! Urrrrrrrrrrrrrrrrr!!" and ran out of the restaurant still growling "URRRRRRRRRR!!" so who knows?
Oh BTW Sally Field went to the same junior high school I did. The drama department auditorium/theatre was named "The Sally Field Auditorium" in honor of her. She was, however, a few years ahead of me.
Swan