Type 'I solemnly swear that I am up to no good' to open the map. Type 'Mischief Managed' to hide the map again. You can also type 'I am Severus Snape' or 'Reveal Yourself' and see what happened. If you press space then the background and characters change. There is music that goes along with it.
The idea is from Harry Potter. If you have any suggestions on what to add, please let me know in the comments.
