Collecting Sounds...

There's a couple of sounds that I'll actively activate if I ever come across the opportunity.

One is the sound when you hold a full ream of paper by the edges and finger tap the underneath. I work in an office so the opportunity does present itself quite readily.

This one is only available under these conditions.  Find a fair body of frozen water and skim any object across the surface.  It produces an amazing resonating big pinging that because of the lack of friction, goes on for ages.