One of Twins by Ambrose Bierce — Read

YOU ask me if in my experience as one of a pair of twins I ever observed anything unaccountable by the natural laws with which we have acquaintance. As to that you shall judge; perhaps we have not all acquaintance with the same natural laws. You may know some that I do not, and what is to me unaccountable may be very clear to you.

You knew my brother John-that is, you knew him when you knew that I was not present; but neither you nor, I believe, any human being could distinguish between him and me if we chose to seem alike. Our parents could not; ours is the only instance of which I have any knowledge of so close resemblance as that. I speak of my brother John, but I am not at all sure that his name was not Henry and mine John. We were regularly christened, but afterward, in the very act of tattooing us with small distinguishing marks, the operator lost his reckoning; and although I bear upon my forearm a small "H" and he bore a "J," it is by no means certain that the letters ought not to have been transposed. During our boyhood our parents tried to distinguish us more obviously by our clothing and other simple devices, but we would so frequently exchange suits and otherwise circumvent the enemy that they abandoned all such ineffectual attempts, and during all the years that we lived together at home everybody recognized the difficulty of the situation and made the best of it by calling us both "Jehnry."