What a movie... LOL (And in my world, that means Lots Of Luck!)
Back in my elementary, when Windoze 95 was popular, the whole computer system got a virus and ran throughout our programs.
However, Macs are NOT completely virus secure. My dad owns a store in New York and he uses an iMac 500. One day my dad tried to boot up and he got an error, saying that the Hard Drive could not be found, or some **** like that. My dad tried to boot from the CD, and he got the same error. It took a phone call to the company he got his iMac shipped from (not directly from Apple) and he worked it out on the phone.
So just in case you guys happen to start downloading documents or opening attachments on a Code Red alert, similar to that of two years ago, there is no guarentee that just because you have a Mac you will be protected. But, I agree, PCs are virus prone.