hi all --
i had a bizarre occurrence this evening - shut down the laptop at work, came home & on booting ran into a strange problem. something altered my rc.conf file (not me, i promise)

to the following:
119 ifconfig_wlan0="WPA"
120 ifconfig_p<94>˙˙˙^?="`ifconfig em0 ether`"
121 ifconfig_p<94>˙˙˙^?="ether ${ifconfig_p<94>˙˙˙^?##*ether }"
122 wlans_p<94>˙˙˙^?="wlan0"
i'm dual-booting with the 20120605 snapshot & was able to edit the primary rc.conf back to a normal state, but does anyone have any idea how this might have occurred?
thanks!
(ps will attach photos shortly)
EDIT: here's a link to a small imgur album:
http://imgur.com/a/4hURr