I've just uploaded a small and straight forward script called "Random video".

It will choose a random video from the folder videos/random.

I've just included the "test.mp4" video so the directory will be created.
Replace the directory content with your own JOI (or whatever suits you) videos and the script will pick one at random and start playing it.

Random video

Download

I added a German translation to the script

Do you als have video's I can put in the video folder, there is just one now so it is every time the same?