Terry Pratchett said this quote

I dinna want to disappoint ye, but we's in a cellar right here, and it's full o' tatties.'After a while a voice said: 'So where izzit?''Maybe it's got the day off?''What's a demon need a day off for?''Tae gae an' see its ol' mam an' dad, mebbe?''Oh, aye? Demons have mams, do they?