Fran Drescher on Night Court (1987)
In the episode "Author, Author."
Miriam Brody (Fran), takes a repairman to court because of his indecent conduct towards her.
It turns out that Miriam has a double personality. One moment she's an outraged,
bun-haired lady with spectacles and next thing you know...
...the long thick hair is released, the glasses come off and she's purring in
District Attourney Dan Fielding's ear.