The eternal disconnect between developer expectations and user reality! The phone is asking for a fingerprint scan with the instruction "Hold your finger," but instead of using their fingertip like a normal human, the user is pressing their entire thumb sideways against the screen. This is why we need 75-page user manuals for features that should be self-explanatory. No matter how "intuitive" you think your UI is, somewhere out there is a user trying to scan their elbow because the instructions weren't specific enough. Pro tip: Always assume your users will interpret your UI in the most creative and incorrect way possible. It's not a bug, it's a feature of human creativity!