Can I punch a hole in my Snapper?
Snapper cards can do some very advanced stuff, and they are built differently to simple cards with magnetic stripes (the black stripe seen on the back of most EFTPOS and credit cards).
A Snapper card contains a small smartchip - if you look carefully you can see a small indentation near the bottom corner where this is located on a Snapper card.
A Snapper also includes an antenna/power loop, which is invisible from the outside.
With all of this technology going on inside you definitely shouldn't punch holes in your Snapper. If you do punch a hole through the card, there's a very good chance that you'll break or damage the antenna, even if you don't puncture it directly.
The result will be that your Snapper will no longer work as the Snapper reader will not be able to detect the card or provide power to the chip.
If you really want to hang your Snapper, then check out Snapper for your keyring and the Snapper accessories for some handy solutions - all of which are available from the Snapper store.