Uncle Jaque (or Uncle Jack, or Oncle Jacques, or Onkel Jakob?) - For an outhouse we have in German slang Plumpsklo = thudbog.

Witty and humourous German singers are Reinhard Mey, Ulrich Roski and Hannes Wader (the famous three of Berlin, in the seventies).
And there were Ingo Insterburg and Company, in the same time, famous for their musical jokes and sometimes very unusual instruments.

Learn German with the Hymn to Mrs Pohl, his old landlady, about the conflicts after a jag in her house (Hannes Wader also mentioned as a participant).One of my favourite songs - I had some strange landladies, too, at university.