A tip o' the hat to Australian reader Snoggeramus for forwarding the link to today's winner - a (presumably) successful businessman and (clearly less successful) gardener in New Zealand.
Businessman Paul Currie was in a hurry.
He was at his holiday home in Rata St, Wanaka, about to head home to Christchurch.
The new lawn was looking great, he thought.
Just those broadleafs.
Perhaps he should give them a quick spray before he left.
That was a month ago.
Then the phone calls started - from neighbours who wondered if the brown marks appearing in his green lawn might have been caused by vandals.
That got Paul thinking.
He had bought four new sprays for various purposes and had reached into the cupboard for the one recommended for broadleaf weeds.
But then, he remembered, he had not actually been wearing his glasses at the time.
The penny dropped.
Instead of using a herbicide for broadleaf only, he had accidentally used a broad-spectrum herbicide containing glyphosate - good for any grass that needs to be turned from green and healthy to brown and dead.
There's more at the link, including a photograph of a once-beautiful lawn that looks as if it had been tagged by a prolific but particularly inept graffiti artist. I'm sure it'll take Mr. Currie a long time to live down that mistake!