Crikey! It's like a Piccadilly Circus in here!!!
Best used to describe a very chaotic noisy scene, when it is quite clearly silent, calm and tranquil
You walk into the doctors waiting room, and it is clearly very quiet, but you can't help but grab your head in agony and say with the poshest English accent you can imagine:
"Crikey! It's like a Piccadilly Circus in here!!!"
"Crikey! It's like a Piccadilly Circus in here!!!"