Bad for Shidduchim has some terrific stories about how some people have "accidentally" found their one-and onlies:
Where To Find A Date: Case Studies
I once heard the following story:
An 18 year old American girl was spending the year in Israel. An older Israeli woman whom she had befriended kept mentioning that there was an Israeli man she knew who was just wonderful and would make a terrific match for the girl. The girl felt that she was nowhere near ready to get married, so she kept refusing the woman's offer to set them up. One day, feeling bored, the girl took a walk on the beach and met three handsome Israeli men. She really liked one of them, and they began dating. The relationship quickly grew serious, and they began to talk about getting engaged. The girl brought her boyfriend to meet her older friend. The moment that they walked in the door, the woman cried out "This is the boy that I wanted to set you up with!"
The couple has been happily married now for 25 years.
Weinstein, Mayim Bialik and the Perils of Religious Instruction - *I wrote the following for my Beit Midrash's weekly email, and on reflection I'd like to get feedback from a broader population, so I'm reproducing it here...
5 hours ago