Two neighbors out walking their dogs...the dogs did what dogs do when they get together...play and 'smell' and chase each other. Soon the retractable leashes are around the one neighbor's legs and the leashes are tangled. There wasn't an accident but I could see where this could have happened. The one neighbor is in their 80's and the other too has health issues. This could have been a horrible affair if they'd not have been still at the time so could untangle the things.