All vacationers should know this bizarre life hack: put a coin in the freezer. If the freezer compartment fails to cool, food can spoil quickly.

A simple coin trick can help consumers exactly then. The life hack is very simple, but in an emergency it can even protect against food poisoning, as “RTL’s” reports. The danger: If the refrigerator defrosts, food quickly goes bad due to the interruption of the cold chain. Often the only thing that helps is to throw away the food to be on the safe side.