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This article is a commentary on the passage in the Blue Book where Wittgenstein describes the “mental cramp” that certain attacks of philosophers against common sense express, in order to propose a therapeutic diagnosis about it. The aim of this article is, first of all, to explain how and why the solipsist’s cramp and his protest against the ordinary use of language reflect a rigidity and an internal rebellion that are inherent in this very use. It also aims to explain the reference to mathematics that the word “notation” conveys in the text, and the role that this reference plays. Finally, by way of conclusion, it outlines how Wittgenstein traces back a whole class of philosophical cramps to a certain mechanism, however ungeneralizable the latter is doomed to be.