Imagine you are out for an early morning jog. Someone has their sprinklers on, so you cross the street to avoid them. Unfortunately, there was a malfunctioning sprinkler head that you didn't know about. It's dark so you couldn't see it, and since the sprinkler wasn't working and wasn't spraying water, you had no other way to know it was there.
As a result you step on it, it breaks, and begins gushing out water. Naturally you leave a note claiming responsibility for the accident (it's early in the morning and the home owner does not appear to be awake, so you don't want to knock).
What would be your legal liability in such an instance?