Emergency pop-up flash diffuser

I’m not sure if this is again one those things that i’ll get to hear about how everybody has been doing it for ages. But to the point, i found out that the white cap that comes with Nikon batteries and grips makes actually a quite nice diffuser for the pop-up flash. It also has a little belt-clip that fits perfectly to the flash shoe for keeping it safe.

Here the cap is with/out the cap diffuser.

And below you see how well it works.

And if you look here, the commercial big flash diffuser caps work in same ways as this trick. Also some people make these from film canisters and cigarette packs.