Ok, I have this fertilizer/pesticide customer with irrigation. They did not want to sign up for my yearly fertilizer program which also includes winterization/de-winterization of irrigation systems. No big deal since they'll just go "pay-per-service". When I sent out emails and letters letting everyone know if they wanted me to de-winterize their systems, he inquired about the price. I answered back and never heard anything else out of them. That was about 3-4 weeks ago. Today while mowing next door to them (regular full-service customer), the wife comes out and says her husband had emailed me this morning about the irrigation system. He and a neighbor (who had dewinterized his own system) tried to get this couple's system going but it wouldn't work. They wanted me to check it out and see what he was missing. Of course, I checked the backflow and like I thought, it was on backwards. I fixed that and reprogrammed the controller with the current day/time and checked to make sure last year's programming was still there. Since their rain sensor wouldn't allow the system to run, I told her to watch and see if it runs later this week when it's supposed to. I then left. Would you bill this couple anything at all or not? Yes, I only turned the backflow around and programmed the controller (more or less). No, I didn't run the system since I didn't know if I should even bill them or not and I really didn't have the time. The kicker is I offered to do this for them, they tried to do it themselves, and I ended up doing "some" of it. Last year a similar yet different thing happened with them but I truly believe both occurences were unintentional.