In tongue twisters such as “she sells sea shells”, a particular combination of phonemes pronounced at a pressing rate could lead to unintended hilarious utterances. Nevertheless, when the tongue twists, it is not only funny. It provides also precious information about the underlying mechanisms of speech production, otherwise hidden in well-formed utterances. Psycholinguists have elicited speech errors, phonological and phonetic in particular, with various techniques. Still, the origin and the mechanism of speech errors is a matter of debate...