Phoebe gets angry with Joey when he blows off dinner with her for a date. The tables are turned however when her scientist boyfriend David returns to town for one night -- the same night when she's scheduled to go to dinner with Joey. Monica is upset by her lack of invitation to a cousin's wedding, especially when she finds out that Ross was invited "with guest". Chandler accidentally gets a cheesecake delivered that was intended for another apartment. When he and Rachel start eating it, they are unable to stop and refuse to give it back.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Rachel and Chandler get hooked on the home-delivered cheesecakes meant for another tenant. David ( Hank Azaria ), Phoebe's Scientist Guy, is in town for just one night and wishes to have dinner with Phoebe. However, she already has dinner plans with Joey. Phoebe has to decide whether to blow Joey off after criticising him for having done it to her the night before. Monica is upset that she is not invited to her cousin Frannie’s wedding. Monica goes as Ross’s plus-one anyway, only to discover that Frannie is marrying Stuart, who once slept with her.