randomness

Last night remembered a random incident.. I was in middle of writting up my assignments.. dealing with RNA DNA.. a tonne load of molecualr techniques.. and then I recalled walking under the river thames.. being at the royal observatory .. all at Greenwich.. nearly two years ago that too in month of december.. had an urge to thank the person who accompanied me there.. i wonder what triggered it in my mind.. such a randomness.. i surprise myself.