Hi. Some of your comments really made me laugh! So, it surprised me I heard him because I've never heard anything other than a vacuum or water in the pipes. This just made me aware he can probably hear a lot more than I previously thought.. Luckily I don't have loud bathroom trips often. I definitely regretted the super loud fart I ripped about 5 minutes prior to hearing him though. :p Anyway, neighbor acts cool so all is well!