S05E12: Weep No More My Willow

Samantha wants to keep a willow tree in her yard and decides to treat it. She calls Dr. Bombay to make her tree weep, but Samantha gets caught in the spell and each time the wind blows, she starts crying. When Larry hears her cry, he thinks that she and Darrin are having a fight and comes over to comfort her, but not before Dr. Bombay comes by to give her an antidote to make her laugh. When Larry comes by, Samantha starts laughing and laughing, and Larry starts laughing too. Then Darrin comes in to find Samantha and Larry laughing for no apparent reason. Then Dr. Bombay comes by with another antidote to make everything and everyone normal again.