Kinda like “the dog that didn’t bark”?
...The Curious Incident of the Dog in the Night-time...
Colonel Ross still wore an expression which showed the poor opinion which he had formed of my companion's ability, but I saw by the inspector's face that his attention had been keenly aroused.
"You consider that to be important?" he [Inspector Gregory] asked.
"Exceedingly so."
"Is there any point to which you would wish to draw my attention?"
"To the curious incident of the dog in the night-time."
"The dog did nothing in the night-time."
"That was the curious incident," remarked Sherlock Holmes.
Do you believe in coincidences? I think not!