Things can't see in HK

Being in Australia meaning that I can see a lot of things that can't be seen in HK.
one of those is the warplanes
it's impossible see one of those warplanes in HK as we don't have a proper army
so when the first time seeing them flying before my eyes was really exciting !
they are fast, and noisy  !!
they are real noisy, you can hear their engine screaming before you can actually see them.
so whenever I hear that big, huge noisy sound, I can be 100% sure that it was one of those birds.

will share my "things can't be seen in HK" again , next time :)