SM doesn't have a fence around his yard, so he's taken to chaining his Labrador to a stake in the yard. She most obviously hates the arrangement, because generally people (and taunting squirrels) stand just outside her range of mobility. So, she devised a scheme of genius proportions. She took to peeing on her chain in the same place every day. Eventually, the chain started to rust (and possibly corrode) from the excessive moisture. When it became weak enough, she gave it one violent jerk, and "Ping!" it snapped.
R.I.P. Mr. Unsuspecting Gray Squirrel...