The other side of that coin is "n00bs wit atttitude". These guys come in for the first time thinking they have to prove something. Sparring with them can get downright dangerous. Usually when that happens, two or more of the advanced students will have a talk with the new guy and explain to him how most of us have jobs, school and other important things to do tomorrow and we cannot afford the risk of getting hurt. If that doesn't work, we start yelling at him during sparring to ease up, loud enough for everyone to hear. Hopefully embarrass him into easing up. And if that doesn't work, he's probably never going to change the attitude and he's asked to leave.
Our last one like that was this really nice friendly guy; air force reserve, EMT, young, fit, strong. Very inexperienced. He just didn't seem to know how to hold back. The worst part was he also had his wife there, training with us. We wound up having to take turns kicking his butt with more advanced techniques until we wore him down. It was humiliating and grueling and he even lost some time off from work and training because of sore ribs, sprained muscles, etc. Totally unnecessary.
