Many times, I had already had the impression that what I was hearing was desynced from what I saw.
Could this be caused by the speed difference between light and sound? Or is sound still fast enough that this shouldn't be possible without any tools, and what I'm observing is caused by something else?
Most commonly I'm observing this, when I'm in an area where it is ..... quiet quiet.
And seeing someone walking on solid ground at like ~300 meters away with something sandy on it gives a crunchy noise when the shoe touches the ground and crunches the sand. But when observing this, I just hear the noise when I see the foot raising.