Unless you got photogenic memory, having a no-mistake remembrance over something that you must see then call it back over can be pretty hard and rare. I guess the saying 'know you like the back of my hand' is also sort of accurate since you won't really ever get to know someone 100% for sure; you are simply just not them, therefore you'd only know them up to a certain extent or get a certain idea.
We break from Know You Like The Back Of My Hand? Really? to share infobreak from past times:
Today is: 30th May (GMT), in history on the 30th of May, 1946 AD the following event happened:
United flight 521 crashes on takeoff at LaGuardia Airport (NY) 42 die