You can have the greatest player in terms of mastering an instrument and you could be yawning your head off when you hear them. So, it's not what you do, but the way you're doing it and in the end that's all that we have. ↗
Our cautious ancestors, when yawning, blocked the way to the entrance of evil spirits by putting their hands before their mouths. We find a reason for the gesture in the delicacy of manner which forbids an indecent exposure. ↗