How Has Siri Let You Down?

I had a great idea a few days ago. I thought I could more easily mark emails as read by using Siri. I asked Siri to show some emails from a sender and it did but only the 25 newest. I should have known that marking them as read wouldn't work. It wasn't a big problem, but it reminds me that Siri has defined limits and they're easy to reach. What are your bad experiences with Siri? How has Siri let you down?