High Pitch Cell Phone rings!
 

My grandson asked me if that high pitched sound in out family room bothered me. I said What Sound?? After going into the room again he asked ?Can't you hear that?" Nope I replied.

After investigating we found it was coming from the TV but I couldn't hear it (I don't think my hearing isn't all that bad - But my wife might have a different opinion) .

He then mentioned that it was funny I couldn't hear it but he said its kind of like the kids in school that have cell phones. They ring all the time but the teachers can't hear them because they set them to a high pitch ring tone. Everyone laughs but the teachers don't know why!

You learn something new every day. You might want to ask your kids to check their kids cell phone rings if they take them to school with them.