Misfortunes never come singly

Proverbial Meaning: Bad things seem to happen one after another.

Literal Origins: The feeling that misfortunes never seem to be isolated could be a product of our own negative thoughts, brought about by a single misfortune, or the misfortune may trigger a series of connected misfortunes.

Common Usage: This proverb is practically unheard of.

See: It never rains but it pours.