A Joke----Visitying Niagara

Tourists at Niagra falls.

Guide: "I welcome you all to the Niagra Falls. These are the world's
largest WaterFalls and the sound intesity of the WaterFall is so high,
sound of even 20 supersonic planes passing can't be heard!

Now may I request the ladies to keep quiet so that we can hear the Niagra
falls??..."