http://balldroppings.com/js/

Click and drag to draw lines. When the ball hits the line it makes noise.

I spent too much time on this. At least I was at work

Yes, this is fucking sweet. All it needs are some alternate sounds to choose from, or possibly just a control for pitch range. I wonder how feasible it would be to design an interface that would allow users to upload their own short sounds. Because that would be crazy.

A library of alternate sounds would be pretty easy to implement, not sure about pitch. Uploading is a different beast, but feasible.

I might try to program something like that, as it uses a lot of little challenges I'll face in the future.