This is interesting, but I’m not sure how much truth there is to it. Saw this posted on twitter by AskAroundOttawa and so I had to try it. As it turns out, I can hear the sound just fine, and I’m well over 25 so… I sent it to Dave to see if he could hear it, and he said he couldn’t. Then he turned up the volume and was able to hear it too. So – what about the rest of you out there – can you hear this sound?
I remember doing hearing tests in school at different times, the last time was when I was in high school. Might be fun to go for one now, although I’m not sure where I’d go for something like that. Maybe I’ll ask my doctor about it next time I’m in to see her.

No problem. The sound didn’t really bother me but drove Anika nuts. Then again, she is closer to 25 then I am.
I didn’t like it very much, and now I’ve got half the neighbourhood’s dogs in my front yard…
Really annoying! It made me happy, though, since I’m an old lady!
Never heard a sound. Played at full volume three times.