(it) happens to the best of us

Everybody makes mistakes or experiences failures, so don't worry too much about it. A: "I really screwed up in work today, and I feel awful about it." B: "Hey, it happens to the best of us. I'm sure everything will be fine." A: "I got so nervous during the presentation that I forgot nearly half the material." B: "Ah, it's not the end of the world. Happens to the best of us!" It happens to the best of us, honey. I'm sure your teacher will be understanding—she knows you didn't get sick in class on purpose.