Once in a Vial

 is the eighteenth episode of the fourth season and the 125th episode of the Bewitched series. The episode was completed by November 9, 1967.

Plot
Endora summons Samantha's former boyfriend Rollo to try drive a wedge between her daughter and Darrin. At a dinner party for client Bo Callahan, chaos ensues when Endora and another guest accidentally drink a love potion Rollo had intended for Samantha.

Trivia

 * The title alludes to the phrase "Once in a while".

Cast

 * Elizabeth Montgomery as Samantha Stephens
 * Dick York as Darrin Stephens
 * Agnes Moorehead as Endora
 * Joan Tompkins as Harriet Walters
 * Frederic Downs as J. P.
 * Mary Lansing as J. P.'s Wife
 * Jan Arvan as Maître D'
 * Darlene Enlow as Girl
 * Henry Beckman as Bill Walters
 * Ron Randell as Rollo
 * Arch Johnson as Bo Callahan