I'am also on 2nd floor next to window. I read this comment first and then went to play the test file. And I still moved my head to the right to see who's knocking.

read the comment, read the article and did all the tests. Got to this one and it still freaked me out. That's crazy.

Same here. I work right next to the sliding glass door in our kitchen (door is to the right of me). Didn't read the description fully and jumped when it sounded like someone was knocking at my door, then at the window to the rear-left of me...

I didn't have my headphones handy, and I just randomly played the 22 kHz >> 8 kHZ test on my MBP's built in speakers and all of a sudden my dogs just started going nuts when the announcer gets to around 14 kHz. Oops!

I guess my ears are strange, I couldn't hear 22 kHz >> 19 kHz (tried on headphones and speakers) but could hear 18 kHz >> 9 kHz. If under 14 sounded anything to your dogs like it did to me I feel sorry for them, I felt like barking.

ME TOO. That was my exact experience: second floor, window, didn't read ahead. My volume was near cranked too. Just about jumped out of my skin.

Also, extremely cool!

Happened to me. I way laying in bed already, next to a window, when I did the same... ;-)