One of the Dripworks Micro-flow valves in Mary’s garden blew a fan-shaped spray into the air when she turned the water on for the first time this season. Fortunately, the main valve is far away and she didn’t get hosed down.
I replaced the deader from my Bag o’ Prepared Spares and autopsied it:

The poor thing may have frozen and cracked during the winter. Seeing as how this would have been its fifth year in the garden, we can’t kvetch too much.