Just a small repair on the sprinkler system that I personally installed back in 1999, so in the last millennium!
I built the system with 14 sections, and a total of 99 spray heads. My master gardener wife has taken over more and more of the yard and turned it into flower gardens. The photo above shows where it was connected to the T on the right of the second image. That glued in joint just pulled out.
I have a water well to irrigate with. No pressure tank, as the valve opens then the well kicks on. The next sections valve opens and the previous one closes. None of it was designed or really glued together as a pressurized system. This one flowerbed, she decided to convert to a drip irrigation system. So I just separated the flower bed section from the well, and hooked it up to city water so it can handle the pressure.
I can only assume it was the one glue joint that I clearly used primer on, and did not get glued together with enough glue.
So one connection that came apart after 26 years. Not too bad for a novice sprinkler system installer. I sure know what idiot is to blame.
21 years later I fixed it under warranty! 
Only a billionaire can pay me enough to install another sprinkler system in August in Oklahoma, or anywhere else on the planet.