You can buy a pen like this, but the more ambitious tinkerers among you may try to make their own. Instructables user Mrballeng shows you how to make a reliable click ballpoint pen with two .30-06 cases. Find photos, written instructions and a lengthy video at the link.
Link -via Make | Maker's Website
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I always wonder if this would work on physical goods, where there is a non-zero cost of goods. It's iffy - but there are some pay-what-you-want restaurants that boost their profits with this scheme.
I have read through the various links and forums and it is very interesting (if you are into this sort of thing :)
Yes...I am cheap.
It is a great games especially if you play it on a tablet.
What makes it even better is the lack of DRM.