Oin-Oin is a character of Swiss folklore in the Romandy, somewhat comparable to Till Eulenspiegel. Oin-oin is a simpleton who still manages to get out of difficulties with humour and a unique sense of retort.
The historical model of Oin-oin is Amédée-Célestin Rossillon (1852-1923). Rossillon worked as watchmaker in La Chaux-de-Fonds. His nickname was due to his pronunciation of oui "yes" due to a hare lip which he covered with a moustache.
- Le Retour de Oin-Oin, c'est comme une fois y'avait, Éditions Cabédita, 2002.