Spreadsheet errors (literature)
http://www.eusprig.org/
The people who collate and promote research on errors in spreadsheets (Panko is yer man)
https://www.ft.com/content/0fdc6e62-2f23-11e5-91ac-a5e17d9b4cff
Popular article on the phenomenon
http://www.bbc.co.uk/news/magazine-22223190
The old sum(A1:thingy) joke
https://www.joelonsoftware.com/2006/06/16/my-first-billg-review/
Joel Spolsky's recollection of a meeting with Billy G
Icon: happy weekend all