"i ll teach him a lesson he won t forget" in German I'll teach him a lesson he won't forget. Ich werde ihm einen Denkzettel verpassen, der sich gewaschen hat. Detailed translations for "i ll teach him a lesson he won t forget" I'll teach him a lesson he won't forget. I'll teach him a lesson he won't forget. Ich werde ihm einen Denkzettel verpassen, der sich gewaschen hat.