I need a virus for OSX. Any suggestions?

[kiyaa]

So a friend of mine got into a long argument with a friend of his about whether macs can get viruses. Now, I know that Macs are pretty secure, but my friend's friend did something stupid and offered free access to his mac so that we can try to infect it. The bet is not that there are viruses that will get around the built in safeguards, nor that we can hack it (we don't have that kind of skill), but that we can intentionally infect it with something. So basically the goal is to screw him by turning off the firewall and loading anything and everything.

So the question is, how do you find an actual virus for download for a mac? With a windows system I would just disable all firewalls and such and start downloading and clicking everything in sight. Hell, is it possible to just write a mac equivalent of a batch file to format his personal files?

The funny thing is that we really don't care about the mac vs windows argument. It's just that this guy doesn't believe that it is possible to do anything to a mac even if you are trying to.
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