Love Potion No. 9
Paul Matthews (Tate Donovan) is a lonely biochemist with a crush on his unavailable co-worker, biologist Diane Farrow (Sandra Bullock). His friends take him to a gypsy on 34th and Vine named Madame Ruth (Anne Bancroft). After reading his palm and seeing absolutely no romance in his life, Ruth gives him a small amount of Love Potion No. 8 on a piece of paper. As a scientist, Paul has doubts and ends up throwing it in the trash when he gets home. Around this time, Paul's friends buy him the services of Marisa, but all they do is talk.
His cat gets into the trash and eats some of the potion; then it meows and attracts all the other cats in the neighborhood. When Paul sees the results, he takes it to Diane, and they find out the "scientific" properties of it. After analyzing it, they decide to use themselves as human test subjects. Diane ends up attracting an Italian car mogul and the prince of England, ending up getting a makeover in the process, while Paul has a string of hookups with women in bars, supermarkets, cars, sorority houses (notably Alpha Tau Omega at Georgia Institute of Technology), and female dormitories (notably Balch Hall at Cornell University).
Paul and Diane realize their romantic attraction to each other and become involved. Eventually, Paul plans a proposal to Diane; however, when he comes by her house to do so, she's not there. Later, she tells him she has fallen for Gary. (We have seen Gary before, taking advantage of her loneliness to have sex with her.) Paul is devastated and decides he really wants to get her back. Marisa comes to his house to steal his stereo, and after trying the potion in his bathroom, she makes Paul gladly give her all his valuables, including the potion.
After "waking up" from his infatuation, Paul gets an idea, and Madame Ruth confirms that somebody looking like Gary has bought all the potion No. 8. He phones Diane to tell her Gary is using the potion on her, but Gary forbids her to talk to him. After weeks of unsuccessful attempts, Paul goes back to Madame Ruth, who gives him Love Potion No. 9, which will not create love, but remove things obscuring it (such as potion No. 8). But if Diane was never really in love with him, Paul will love her for his entire life and she will eternally hate him.
Paul asks three friends to help him force Diane to take No. 9, but they can't believe him. Marisa arrives at the house and uses No. 8 to rob all of them, proving the power of the potion. When they arrive at the house, Diane's friend and matron of honor tells them Diane and Gary are marrying in an hour, but that she suspects something is wrong with Diane. Paul explains, she agrees to give Diane the potion, and things go terribly wrong, but Marisa, having tricked Gary's potion bottle from him, causes havoc and effectively ends the wedding, which gives Paul the chance to drink Potion No. 9, kiss Diane and wait five minutes as per the instructions. The effect kicks in too late but in the end, Diane runs away from Gary into Paul's arms.
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