Crystal Clear Replay

Every now and again time stands still and a crustal clear replay of an event in your mind will make you giggle. I have often wandered how it just pops in your mind and consumes your attention and you become oblivious to your surroundings then ZAP your back in real time. They are usually random clips of days gone by that have nothing in common with what you were doing at the time. As you shrug your shoulders and smile you carry on with what you were doing and that clip of a memory flees your mind as quickly as it came.