What's The World's Worst Sound?

1. Vomiting
2. Microphone feedback
3. Many crying babies
4. Train wheels scraping and squeking on tracks
5. Seesaw squeking
6. A violin being played badly
7. Farting
8. One baby crying
9. An argument on a TV soap opera
10. Electrical mains humming
11. Tasmanian Devil
12. Cat spitting and howling
13. Coughing
14. Mobile ringtones
15. Creaky door
16. Fingernails scraping down a blackboard
17. Sniffing
18. Dogs barking
19. Polystyrene squeak
20. Dentist's drill               

source : National Geographic Magazine MAY 2007