Good or Bad - Having a good memory?

I and a few friends had gone out shopping yesterday...
did a lot of walking and roaming around in the shopping mall... then all of a sudden i thought i saw someone i knew from college... then all of a sudden I got back the memories of my first year of Engineering and all the stupidity that I had done...
i don't know how but all those memories of the first year which i had for so long after my first year removed from my mind and memory came back in a flash.
Still surviving or i can say suffering, the after effects of having a good memory...