The song " Nice Weather for Ducks " is built around a sample inspired by John Langstaff 's song " All the Ducks " . This song was based on the popular Dutch children 's song , " Alle eendjes zwemmen in het water " ( translated : " All the ducks are swimming in the water " ) . Franglen later said that he and Deakin was drawn to Langstaff 's recording because it " had a gentle madness to it , slightly unhinged " . The duo had attempted to clear Langstaff 's version for sampling , but was unable to . In the end , they had Enn Reitel re @-@ record the vocal snippet . Franglen , while noting that Reitel 's performance was good , said that once the sample was re @-@ recorded , its " edge disappeared " . " Experimental Number 6 " , arguably the album 's darkest track , feature a faux field recording of a doctor documenting the side effects of an unnamed drug administered to a patient ; the recording tell how the patient progress from normalcy , to an " overwhelming sense of well @-@ being and euphoria " , before eventually expiring . The album close with " The Curse of Ka 'Zar " , which feature " a two @-@ part harmony chorus and jazzy drum loop " .