The Generation Zap (S06E24)

Dusty Harrison is the daughter of a client with a big account. During her summer vacation from college, she hopes to learn advertising from some knowledgeable Titan of the trade. Larry picks Darrin to be Dusty's teaching Titan to the chagrin of the over-worked ad man. Endora, always looking for a chance to meddle with her daughter's mortal, gets Serena to cast a spell on Dusty and changes the co-ed from a quiet, serious-minded young lady, into a mini-skirted worldly woman who is madly in love with Darrin, Samantha notwithstanding. Darrin, who is confused and frustrated by Dusty's advances, sends her on a time-consuming shopping spree to purchase various coffee percolators to be used in his latest ad campaign. (iTunes)