Let me explain.
My office window gets direct sunlight in the afternoon—if, that is, it is sunny outside. When it does, it casts a glare on my computer screen, in which case, I pull down the blinds.
But (in accordance with Sod’s Law), the moment I do that, the sun no longer has fun casting a glare on my screen—so it tends to go away.
So I pull up the blinds again—and sure enough, the sun returns (67.3% of the time—significantly more than the 50-50% of it happening by chance).
So I put the blinds down again. And the same thing repeats.