I wish I hadn't cried so much! - Lewis Carroll

"The Hatter opened his eyes very wide on hearing this; but all he said was, "Why is a raven like a writing-desk?"
"Come, we shall have some fun now!", thought Alice. "I'm glad they've begun asking riddles - I believe I can guess that," she added aloud.
"Do you mean that you think you can find out the answer to it?" said the March Hare.
"Exactly so," said Alice.
"Then you should say what you mean," the March Hare went on.
"I do," Alice hastily replied; "At least - at least I mean what I say - that's the same thing, you know."
"Not the same thing a bit!" said the Hatter. "Why, you might just as well said that "I see what I eat" is the same thing as "I eat what I see"!".
"You might just as well say," added the March Hare, "that "I like what I get" is the same thing as "I get what I like"!".
"You might just as well say," added the Dormouse, which seemed to be talking in its sleep, "that "I breath when I sleep" is the same thing as "I sleep when I breath"!".
"It is the same thing with you," said the Hatter, and here the conversation dropped and the party sat silent for a minute, while Alice thought over all she could remember about ravens and writing-desks, which wasn't much."

If doubtful whether to end with “yours faithfully”, or “yours truly”, or “your most truly”, &c. (there are at least a dozen varieties, before you reach “yours affectionately”), refer to your correspondent’s last letter, and make your winding-up at least as friendly as his: in fact, even if a shade more friendly, it will do no harm!

I wonder if I've been changed in the night. Let me think. Was I the same when I got up this morning? I almost think I can remember feeling a little different. But if I'm not the same, the next question is 'Who in the world am I?' Ah, that's the great puzzle!