Full Idea
As an inductive argument Mill's argument from analogy (other people have inputs and outputs like mine, so the intermediate explanation must be the same) is weak because it is based on a single instance.
Gist of Idea
The argument from analogy rests on one instance alone
Source
Jonathan Dancy (Intro to Contemporary Epistemology [1985], 5.3)
Book Reference
Dancy,Jonathan: 'Introduction to Contemporary Epistemology' [Blackwell 1985], p.68
A Reaction
The argument may be 'weak' as a piece of pure logic, but when faced with a strange situation, one's own case seems like crucial evidence, like a single eye-witness to a crime.