In late 1988, I decided to leave my megacorp position to take a University position in Arizona. However, starting January 1989, vesting rules for defined pensions were changing and for my megacorp, vesting was changing from 10 years to 5. Since I'd joined megacorp in mid-1979, leaving at the end of 1988 would mean no pension benefit whatsoever but if I could clock even a little work time at megacorp in January 1989, I would get some pension when I turned 65. So we moved in late December, with me taking some vacation time through the end of the year and I returned to megacorp to work for a week in January 1989 before starting my new university position. I wondered at the time if it was worth the hassle but now I'm glad I did even if my monthly pension benefit is a meager $450. After experiencing the inflation of the 1970's to 1980's, I assumed that amount would be lucky to cover my phone bill 30 years later but it actually covers a lot more even without a COLA!