I discovered this accidentally while preparing a garden plot to grow peppers.

I was using a damaged hand shovel (3 slot item) and while trying to prepare a slot in the garden for the seeds I accidentally pushed "G" rather than "F". This caused my character to throw the shovel to the ground as expected however my character then proceeded to fall down into what looks to be an unconscious state. My character immediately stood back up but fell back down to the ground into the same unconscious state for good. The screen was not black and you could view your character in 3rd person. I was on a 1st/3rd person server at the time. It looks as though your character is playing dead.

Once in the "playing dead" state most of the buttons to make your character stand back up would not work. During my first attempt my cursor luckly had highlighted onto a spot where the "search for sticks" option was highlighted. I pushed "F" and was able to stand up.

The second time I was able to use the "jump, hurdle" command "V" to stand up. The crouch, prone nor stand commands worked.

Once I realized what I had done I attempted to replicate this a few times with the same result using the hand shovel.