I can tell you the license plate numbers of all six cars in the street.
I can tell you that the waiter is left-handed and the boy with the cigarette weights 175 pounds and can handle himself.
I know that the blonde woman has just cried and the woman in profile has a gun and is a policewoman.
I can tell you that the young man with a tie works on the stock-exchange and the gentleman in the red jacket has just become a widower recently. The man in the hat has a lot of money in his pocket and the man in the leather jacket just got out of jail.
Now ...why would I know that if I do not know who I am?
Loosely based on Bourne identity movie