These sources explore the psychological phenomenon of customers who mentally rehearse service calls before a technician arrives. This behavior, driven by the brain's simulation engine, often leads to tension when reality fails to match the customer's pre-written script. The narrator, an experienced HVAC technician named Dave, realizes that he also engages in this mental preparation while driving to jobs. To manage these interactions, he suggests acknowledging the customer's theories early to merge their internal narrative with the actual diagnosis. By inviting the customer to share their expectations, the technician fosters trust and relaxation rather than confusion. Ultimately, the text highlights the importance of empathy and flexibility when two different versions of the same event collide.