Gotta love smart punctuation.
Just yesterday, I had to fix a broken page because someone dared store a link tag in a word document, which helpfully and silently converted its quotes into smart quotes for the user.
I have a Ruby class that's whole purpose is to undo this kind of help in user provided text, but I missed a spot.
Thankfully, I've seen this happen a thousand times, so I knew what was happening. The user didn't though. And trying to explain why her quotes are the wrong kind of quotes would be impossible.
I cannot fathom the arrogance that drives the writer of any text processing application to silently replace what the user inputs, especially what they paste, with what they prefer instead. In the case of apple, they'll even delete other parts of the text if you disagree with their choice.
It's why I use notepad for almost everything and I avoid excel like the plague.