Old wives' tales

When grass is dry at morning light, look for rain before the night.
When leaves show their undersides, be very sure that rain betides.
When an oak leaf is as big as a squirrels ear, that's when you plant corn (eh?).
When there's green in the sky, the cows will fly (that one's from Kansas).
When Jack Frost visits Ben and Jerry, it's time for Waitrose to get their freezer fixed.

(Revenge is a dish best served cold).