I've accidently done this (email bankruptcy) a couple of times recently. We use Outlook at work and the "Mark All as Read" button is right next to the "Run Rule

I've accidently done this (email bankruptcy) a couple of times recently. We use Outlook at work and the "Mark All as Read" button is right next to the "Run Rules Now" button. After a few minutes of shock and trying to remember what was what, it was very liberating!