Our downstairs neighbour has to live with every bump and shout and scrape that we produce. There's only a thin wooden sub-floor and a rather nice-looking but surely sound-transparent cosmetic paneling on top of that. I expect that there are some joists but these do nothing for sound.
So in preparation for Ken's first real birthday party, we took a note and a bottle of wine downstairs to let the tenant know that the party was coming. It seemed the least we could do.
And I have to say, the affair was as noisy as the end of the Earth.