Singularity is almost invariably a clue. The more featureless and commonplace a crime is, the more difficult is it to bring it home.
— Arthur Conan Doyle

The only kind of seafood I trust is the fish stick, a totally featureless fish that doesn't have eyeballs or fins.
— Dave Barry

As a rule, said Holmes, the more bizarre a thing is the less mysterious it proves to be. It is your commonplace, featureless crimes which are really puzzling, just as a commonplace face is the most difficult to identify.
— Arthur Conan Doyle