Well I managed to "crash" my K-3. I was trying to record a video (I set it so video would record to SD2) and I had no card in the SD2. The camera told me I have no SD card and went back to LV mode.
The screen then froze at the movie mode, turning off/on the camera does nothing. I've had this happen to K-5 before and the mirror was stuck in up position when it happened but not this time around.
Battery pull fixed the issue just like in K-5.
I tried to record a movie again trying to replicate the issue but it didn't happen again, hopefully its just a random hiccup...