One letter, two reactions
The puzzle
A woman read a letter from her husband and laughed.
She read the same letter again straight away, and cried.
Not a word of it had changed.
Why did she react differently?
See the answer (spoiler)
Spoilers from here on. If you want to work it out yourself, leave this folded and move on.
Answer
The first time she was laughing at the jokes and the memories in it.
The second time it struck her that this was the last letter her husband wrote before he died.
Same words, different thing to see.