I'm a teacher in the UK and was on strike today (long story, see here for more details).
I joined my colleagues on the protest rally. We marched for an hour and then rallied in the city centre for speeches. During the walk, many whistles, hooters, and other noise making devices were in use (including by me!)
Getting to the point: I now have the worst tinnitus I have ever experienced! I didn't even consider taking hearing protection (I keep ear plugs for various situations) before leaving the house.
Here's hoping I haven't suffered any permanent damage. Anyone got any experience of noise induced hearing loss?