Samantha is Earthbound

Samantha feels a tremendous heaviness and fatigue and when Darrin tries to lift her she seems to weigh a ton. Dr. Bombay's diagnosis: she is gravity leaden because a witch's natural instinct is the exact opposite, namely flying, which she hasn't been doing because of Darrin's directive not to use witchcraft. Dr. Bombay's cure makes her weightless just before she has to participate in a charity bazaar.