ha.ckers points to a proof-of-concept for printing unexpected pages when visiting a malicious web site. It didn't work for me. It relies on network printers listening on well-known IP aliases and ports (such as "myprinter:9100"). Mine doesn't seem to use that name, and I didn't see in the control panel where to configure the name it will use.

It's always fascinating to see the unexpected consequences of the systems we build...