Noise

If anything would or could make noise here, it does. You know how in golf carts there's a loud beep when you put it in reverse? And then even in heavy equipment there's a loud beep when it backs up. Well here even cars have this wonderful feature, only it's not a beep, it's a song. There are many songs to choose from I'm sure, but there is one person on my street who's fairly stuck on Christmas songs. The tone is like the early cell phones tone. So it goes from Jingle Bells, to Santa Clause is Coming to Town, and We Wish You a Merry Christmas.
Also you have to have water filters to be able to drink the water. They play songs as well! Mine plays Fur Elise, however there's a nice button you can push to turn that off! But at the office when the security guards come in to get water they like to hear the song so we get to hear it... the whole thing! That's when you smile to keep from screaming!! =)
Add to that list refrigerators... yes, i'm serious!... when you leave the door open too long it starts playing at you, as one of the kids here loved to point out to me (which makes one wonder how he found that out haha).