777 loud wake turbulence 'howl'
In the first of these two Emirates 777 landings, the weird 'howl' (can't think of a good word to describe it) from the wake turbulence peaks at around 50 seconds in the video - about 34 seconds after the plane has gone by. My experience is that 777's don't usually make much wake noise, but this is probably the loudest I have ever heard from any plane.
In the second landing, the wake is much less audible but its turbulence is very visible.