The name should have given it away, but a couple inspired by a TV show called World's Dumbest Criminals failed to heed the warning.
A scheme described by Judge John McDonald as "harebrained" and "doomed from the start" involved Tuki Hanlon robbing his girlfriend's checkout at the Whangarei supermarket where she had worked for two years.
As Jade Kaire-Laybourn scanned Hanlon's two bags of chips, he gave her a typed note in text language saying he had a gun, and she handed over more than $1300.
Police uncovered the scam three weeks later. Kaire-Laybourn was sentenced to four months of home detention for the burglary and a further month for giving police a false statement.
Hanlon was sentenced to 11 months in jail after pleading guilty to three charges of burglary - one for the Countdown incident and two for breaking into baches.