Full Idea
Knocking over an ink bottle explains the stain on the carpet, and it is not in doubt because you cannot quote the laws involved; a 'causal story' can give a complete explanation without a law.
Gist of Idea
An explanation can just be a 'causal story', without laws, as when I knock over some ink
Source
Stathis Psillos (Causation and Explanation [2002], §8.6)
Book Reference
Psillos,Stathis: 'Causation and Explanation' [Acumen 2002], p.231
A Reaction
But why is he so clumsy, and the bottle so unstable? Was it really (Freudian) an 'accident'? There is no end to complete explanation. But 'I was clumsy this once' and 'I am always clumsy' are equally good explanations.