Making loud noises to get people's attention is considered rude.
Kyle is at a busy coffee shop when he notices his friend in line across the crowd.
Kyle wants to get his friend to look over.
Kyle waves his arms around in the air to signal to his friend.
Kyle makes a loud screeching sound which his friend would recognize as him.
Kyle's friend leaves the line to talk to him and the customers are happy that the line is shorter.
The customers at the shop are disturbed by the noise Kyle is making.