I use a MacBook Pro as my primary workstation, and it's usually connected to the internet via an ethernet cable, although we do have wireless in our house for those "work from the couch" days.

Last night, I needed to borrow the ethernet cable from the MacBook Pro - so I switched the Mac over to the wireless network. No big deal, right? Only, I was running VMware Fusion on the Mac at the time, with bridged networking enabled. Now, bridged networking simply makes any virtual computer inside VMware appear to be an entirely separate computer on the LAN. It's recommended that it is used with Ethernet only. That's because it needs to do some network trickery in order to make it look like the virtual computer is separate from the real one.

After switching to wireless I walked away to get a drink, and when I returned, OS X was displaying a dialog box that read something to the effect of "It appears as though your wireless network may have been compromised. OS X will disable wireless for approximately one minute" - and sure enough, I was offline.

I didn't think to grab a screenshot at the time, but it looks as though OS X didn't like what VMware was trying to do to make itself visible on the wireless network. It misinterpreted it as an attack on the wifi and shut the wireless down. Unexpected, and quite cool!

I'm going to try and replicate it this afternoon to see if I can't get a screenshot or two.