Another bassist and I were used to getting an A each semester in our double bass instruction class. One semester, to my surprise, I got a B. After I mentioned this to the other bassist, she replied, "I got a B, too! I think we need new blood." After realizing that her momentary wish for a new bass teacher was a bit extreme, she continued, "I sound like I'm out for the kill, don't I?"
Most likely, we both should have practiced the bass a bit more that semester.
