**when it rains, it pours**  [TFD][1] an idiom



> When something good or bad happens, similarly good or bad things tend
> to follow.

The saying was also used by the Morton Salt Company. They used it in an ad to sell salt. They were looking for a slogan that could promote their salt that poured freely even when the weather was damp.


  [1]: https://idioms.thefreedictionary.com/when+it+rains%2C+it+pours