choffee posted a photograph:

These two blokes shunned the easy option of putting the "Danger Thin Ice" sign on the fence and opted instead for the better option of walking out a bit, breaking the ice as the went and driving a sign in with a sledgehammer.
[[!meta title="Thin Ice."]]
[[!meta permalink="http://www.zooomr.com/photos/choffee/3924625/"]]
[[!meta author="Zooomr photos"]]
[[!meta authorurl="http://www.zooomr.com/photos/choffee"]]