Ah yes - we served as missionaries in Honduras for 12 years and there is no sound quite like 40,000 people in the national stadium with what sounds like 40,001 vuvuzuelas on hand. I have a couple in our house and my granddaughters love making us jump when they give one a blast.
On a similar 'note', I have seen one single conch shell silence 40,000 people in that same stadium - ¡asombroso!