So, I have a pretty long-winded theory that The Wedding Singer and Wedding Crashers, while both great, are basically the same movie. A thread...
By the third act, the protagonist hits rock bottom and starts projecting his misery at other people’s weddings.
After the douche fiancé finds out about the protagonist’s feelings for the female lead, douche fiancé and his yuppie friends kick the shit out of the protagonist.
During the film’s climax, the protagonist interrupts the female lead’s wedding plans to confess his love for her just in the nick of time.