One of the most interesting notes I've ever read was one I came across while looking through the G.K. Chesterton folders in the British Museum a few years ago.
The note was in beautifully flourished handwriting on a card. It was directed to Chesterton from the irrepressible drama critic, radio broadcaster, artist, sometimes author, and forever bon vivant, Max Beerbohm.
The date was May 4, 1902.
Dear Mr. Chesterton,
I have seldom wished to meet anyone in particular; but you I should very much like to meet.
I need not explain who I am for the name at the end of this note is one which you have more than once admitted rather warmly into your writings.
By way of personal and private introduction, I may say that my mother was a friend of your grandmother, Mrs. Grosjean and also of your mother. As I have said, I should like to meet you. On the other hand, it is quite possible that you have no reciprocal anxiety to meet me. In this case, nothing could be easier than for you to say that you are very busy, or unwell, or going out of town and so are not able as much as you would have liked to lunch with me either next Wednesday or next Saturday at 1:30.
I am, whether you come or not,
Yours admiringly,
Max Beerbohm
P.S. I am quite different from my writings (and so, I daresay are you from yours) so that we should not necessarily fail to hit it off. I, in the flesh, am modest, full of common sense, very genial and rather dull. What you are remains to be seen – or not to be seen by me according to your decision. Any answer to this note had better be directed to 48 Upper Berkley ST W for the porter of this club is very dilatory.