One day a few years ago, I walked out of a store and told Siri to call my wife. She had responded properly, many times before, but that night she responded with “I don’t know who your wife is. Come to think of it, I don’t know who you are.“

I burst out laughing. If I remember correctly, the problem was that my own contact card was no longer identifying me. So, Siri did not know who I was, and therefore did not know who my wife was.