Is it just me, or do my Nikons actually work on my Pentax cameras? Granted, the are mounted upside down, and only in stop down metering, but still, its kinda cool to be able to instantly double my lens selection.
One last part though, you can't be rough on the gear when they are mounted, the bayonets are completely alike, and therefore the connection between body and lens is weak at best. So if you jostle your gear, it will fall right off the front of the body!
Alright, I know its lame, but it does give us some more options.