Jingle shells

No, "Jingle Shells" is not the name of an island version of the Christmas tune. It's what happens when you stand quietly at the water's edge on a relatively empty beach, and listen closely as the waves roll in over this:



When the shells roll over each other in the motion of the water, they sometimes make a lovely jingling sound. There is actually a particular type of shell which is called jingle, because it is especially good at making the sound, but any bunch of small shells will do it under the right conditions. It's lovely beach music.