If you've watched any of the FIFA World Cup games, you've had to listen to the constant background noise from the vuvuzela crowd competing with the commentators' description of the action.
The noise is relentless and is reported to be at 127 decibels (for comparison, a chainsaw in operation is about 100 decibels; a jet taking off is 130 if you were to be standing next to the engines).
For the uninitiated, here's a guide to proper use of the vuvuzela.
click on image to enlarge
Personally, I hate the blankety-blank things.