It is raining cats and dogs.
Being blue.
All ears.
Wanted like a bad penny.
Blessing in Disguise.
Break a leg.
Laying low.
Add fuel to the fire.
Being sad.
Being unwanted.
Not to draw attention to yourself.
It is raining heavily.
When someone really wants to hear about something.
Good luck
When someone makes a bad situation worse.
Something that appears bad at first but ends up having good results.