It works great to have a new master villain do away with an old master villain.
The character who at a very early age is put through a traumatic situation and comes out of it acting meek but is actually the one who can destroy the adversary because of the secret weapon: they are more prepared to fight than anyone else.
Living in a place where everything will go smoothly but if you mess up you got to clear out because the locals turn into hell fire.
A seed waits for rain, sometimes for thousands of years.
The only thing getting out is that which brought the house down in the first place.
A people keep a terrible, creature in the only container that can hold it. The creature dies and it is an individual's duty to go in and clean the cage. The people are attacked while this is happening. That is the only reason that person survives.
The carrier of a disease is not they themselves showing any of the symptoms, they are healthy and yet they are the one who spreads the disease to everyone else.
A single event effects a group of people, for one person (earthquake?) this event spells disaster, for another it is the cause of great fortune.
Grain of sand infects an oyster; Oyster forms pearl around sand.
The blind beetle flies with all its might until it bounces off of something sending it in a new direction.
Take a feather pillow outside to the wind, cut a hole in the fabric, now try to collect all the feathers. That is what cleaning up the damage of gossip is like.
Some bombs go off when the battery dies.
Doing an amazing job in an occupation that really does not matter at all.
The heat sponge absorbs heat when the room is hot, cooling the environment, then releases heat when it get cool, heating the environment.
Someone saved by and accident, man lead to gallows stumbles and fall under the dock and as they are trying to get him out they are run over.