 If it's the heads that rotate and move through a pattern or an arc as they go across, are they moving? First of all, sometimes they can get stuck. They may have been working fine last week and now they're not. And that explains that dry spot or that stress spot that's over there. If you have the little pop-up spray heads that just pop up a few inches out of the ground and spray those type of heads, a lot of those have a small...