Autism-spectrum disorders (ASDs) are a group of neurodevelopmental disorders that are becoming increasingly more prevalent. A diagnostic criterion for autism is the presence of restricted, repetitive behaviours (RRBs), one of which is the intense fascinations for virtually any topic: circumscribed interests (CIs). CIs have the potential to be used for motivational purposes. This study employed semi-structured interviews using Interpretative Phenomenological Analysis (IPA) with individuals with ASDs and their parents. In total, 11 families participated in this study, comprising 33 individuals (16 parents and 17 individuals with ASDs). This study found five themes: He's Very Unique; They Don't Realize that Not Everyone Lives and Thinks the Same Thing All the Time; We Couldn't even Pronounce the Names of These Dinosaurs, and Jason was Telling Us; You Can't Change Them, You Can Only Love Them; and So I Can Do My Job at the Same Time and Observe the Weather at the Same Time.