This is the scene from Going Postal where Antimony Parker and his Aggie come to thank Moist for delivering the ancient letter. I've bent the text a bit and had Aggie be the old woman in the following:
'I said is it true you're opening the old place again?' she repeated. 'My granddad used to work there!'It's been far too long since my Going Postal drawing spree... I miss it so. Maybe I'll pick up my cruelly interrupted Clacks Board when I go 'on hiatus' in a couple weeks.
'Well done him,' said Moist.
'He said there was a curse!' said the woman, as if the idea was rather pleasing. [...] 'It lives under the floor and drives you maaad!' she went on, enjoying the syllable so much she seemed loath to let it go. 'Maaad!'