It really depends on the mistake. I mean, I usually wear a rubber, so I don't have to worry about any mistakes.

But in all honesty, it really boils down to what exactly the mistake is. Some are far more grievous than others, and have the potential to cause far more harm than others. In general though, I'll usually berate the person based on how severe the mistake was, and that'll be that. No use in holding grudges or being a ****, unless the mistake is constant; at that point, we call it stupidity.