It’s a universal problem that has likely bothered us all at one rather unpleasant moment or another.

But now a Catford resident has threatened to go to extreme lengths to encourage local dog owners to take proper responsibility for their pets’ waste.

This sign  – posted Olive Elisa Day on the Shit London Facebook page – shows just how far some people are willing to go to combat the issue.

Questions remain over the praciticality of the promised revenge, but few commenters seem to think the plan goes too far.

Catford may, as Day points out in her post, have been warned, but surely this alarming plot constitutes foul play.