My friend had an even funnier pattern.
I think from around 2003/4 up until a few years ago, she would date for 9 months, be single for 9 months, date for 9 months, be single for 9 months, date for 9 months, etc.
Every. Single. Time.
We threw a party when she made it through the 9 month curse with his current girlfriend. Good times.
This line has me terribly confused and intrigued at the same time.
But I love these things amongst friends, the party idea was great!