Cinderblock

A block made of concrete with holes and the most powerful object to exist. Can somehow solve any problem you could have. Can be used to destroy the universe or just open a can of tuna. You should always carry one with you. A brick is not the same as a cinderblock as it is not nearly as powerful.

Person one: Oh no, all of our food has been stolen but these cans of tuna! And we have no can opener!
Person two: Not to worry, behold cinderblock!