One of the administrative assistants at work was having issues with the copier. I went up and looked at it. Coincidently, the machine choses that second to start working again.
Her: "Did you blow some magic on it?"
Me: "I don't have the Industrial Key."
Her: "What?"
Me: "I um... don't have industrial magic."
Her: "Okay..."
After she left, I realized that if I was a Moros mage instead of a Sin Eater I would have the Matter Arcanum. I also realized that there was no one at work who would get that.