This is the only role-playing game I've ever played regularly. It is rather dumb and only a demo version at that, but it is sometimes mindlessly entertaining:

http://www.i-am-bored.com/bored_link.cfm?link_id=21658 (Warning: It is somewhat violent)

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"Some people complain about the system. The system is not good, so they can't do anything. It's an excuse. Freedom is in your heart." (Jin Xing)