Sometimes the customer is the hack. I had a small install where a narrow side yard was going to work with a fairly pedestrian triangular head spacing. But then, it happened that a pile of rocks was in the way, and I had no intention to move the pile so I could install heads and pipe. The homeowner never moved them, as promised, so I wound up doing a clumsy layout of side-strip heads, that still got it done, but I was kind of ticked, and managed to part ways with the client.
Close to a decade later, the rocks still haven't budged an inch.