Ungdom og Galskap () is an 1806 Danish-language comic opera by Swiss-born composer ÃÂdouard Du Puy to his own Danish libretto. Du Puy's work was based on Jean-Nicolas Bouilly's French libretto for ÃÂtienne Méhul's 1802 opera Une folie. The opera was created for the Royal Theatre, Copenhagen, after a planned production of Mehul's opera was cancelled.