Displays a black image (creating a mirror on the magicmirror) and every 10 seconds will display a scare image full screen for 2 seconds to scare, and then back to the black image (mirror) choses a random image of the 20 defined.
Upload more images to the images directory and update the numImages counter.
To use git clone on the raspberry pi magic mirror, then open a browser on fullscreen and open the html from there. hide the cursor, watch people get scared.
Modify the times to suit your needs