Popular Latin version of the saying sounds "Mus furit et laedit cum gatus omnis abest" - The mouse goes crazy and is glad when there isn't any cat. <Aneta B.>
Thank you Lili for the vote! Yes, it was just what I thought. In Latin it sounds: "Mus furit et laedit cum gatus omnis abest" - The mouse goes crazy and is glad when there isn't any cat.
But, I believe we can add it to the remarks and leave the translation of alexfatt because it conveys the source too. What do you think, dear Lilly?