Here is a note in the September-October 2017 issue of ACM Interactions. A central tenet of HCI, which I have heretofore embraced, is the importance of focusing on the relationship between the person and the machine, treating the person as the most important informant about his/her self. But is that still true when the human has little or no idea what the machine is inferring? HCI as it is will always be important, but it needs to change to help users be aware of the larger trace they might be leaving. We have a responsibility to help users see when they, as it were, have a smudge on their noses or, worse, are giving themselves a permanent Scarlet A!