What that leads me to, is the sounds we hear on a daily basis. We live near a Naval Air Strip, helicopters are constantly flying about. It's a sound that you tend to not hear after awhile, but is strange when the sound stops during the week. My husband works on helicopters and so the kids do enjoy when they see them. His last deployment, it was fun to go for walks around the block and see the birds in flight. My daughter loved to see them and would point, "Mommy Helicoter!" I leave you this pic my SIL took while she was here last, visiting my hubby at work.