The note to Article 5.1.2 (admittedly not the article itself) says:
"A player may resign in a number of different ways:
- stopping the clock
- announcing his resignation
- knocking over his king
- reaching out his hand to the opponent
- signing the score sheets, and so on.
All of these possibilities are capable of being misinterpreted. Therefore the
situation has to be clarified."
But I don't understand this. How can announcing your resignation be misinterpreted? Or signing both scoresheets, if both of them show the result as a win for your opponent?