Answer:
It happens when something has been cut with H2O.
Break it and it is better, immediately set and harder to break again
What can be forever wound up but never annoyed?
A little house full of meat, no door to go in and eat.
When the day after tomorrow is yesterday. Today will be as far from Wednesday. As today was from Wednesday. When the day before yesterday was tomorrow. What is the day after this day?
When is it bad luck to see a black cat?