But you have eyes, right? And a brain, and live through your own experience and can reason about it, right? When was the last time someone undercharged you or

But you have eyes, right? And a brain, and live through your own experience and can reason about it, right? When was the last time someone undercharged you or didn't charge you at all by mistake? Is this a common occurrence? What's the proportion of overcharges vs. undercharges you have observed in your life?