Xander lay in bed petrified. he was getting married in less than 24 hours. He couldn't do it. This was more than cold feet. He wasn't ready. He had to stop the wedding.
He rose to his feet and snuck out of the apartment. When he was safely out of Anya's hearing range he broke into a run. He ran all the way to his car. Then he drove. He knew where he was going. The Magic Box. Even though it was after hours and the shop was closed he had the key.
He let himself in and turned on the lights. He went to the books and pulled out a random one. Then he sat it on the table and opened to the middle.
"Wow, I'm lucky," Xander said aloud as he read the bold letters indicating the title of the spell. "To make things as they're not."
The spell went on to say he had to read aloud the words while burning a candle and thinking of how things should be.
"That sounds easy enough," Xander said, then lit the candle and read the spell. "As life is no longer shall it be. As they see no longer shall they see. Reverse they are and now ever shall be."
When Xander started reading the spell he though only of the words and him and Anya not getting married. Then he saw the word they and assumed that was to make everyone else forget they were engaged too. So he thought of all his friends: Buffy, Willow, Giles, Dawn, even Spike, as well as Anya.
As soon as he finished the candle blew out and he passed out, falling onto the floor.