A yeshiva bochur calls the shadchan and presents an interesting request.
"I want the meanest, most obnoxious girl in the world. Find me a real witch, someone overbearing and unpleasant."
The shadchan naturally is surprised by the request, and she presses the boy to explain.
"My rebbi said that someone whose life is a living hell will get kaparah for their aveiros and will get a straight ticket into Gan Eden. I want to suffer through marriage."
The shadchan agreed, and called him back a short time later with a shidduch. The boy went out on a few dates, but did not discern any unpleasantness or attitude. Dejected, he called the shadchan.
"Don't worry," the shadchan assured. "I've gotten the worst reports possible about this girl. She must be just putting on a show because she's dating."
So the boy went out another few times, and they got engaged. After the marriage, he waited for her true personality to emerge, to no avail.
Finally, five years into their marriage, he turns to his sweet, gracious wife and confronts her about the discrepancy between her reputation and her actions.
His wife sneers at him. "I know why you married me," she replied. "And I want you to buuuuuuuurn!"