Maritime Provençal
Jan per coumpagnié se bagnavo emé soun auco.
Meaning
John, for the sake of company, bathed with his goose.
Note : This proverb answers to the idea that one often does what one sees being done, which is also found in: De coumpagnie un capelan se maridet — by way of company, a priest got himself married.
Theme
Source : La Tour-Keyrié, Recueil de proverbes provençaux (1882), Gallica — public domain. Maritime Mistralian normalisation by Lingua Nostra.