Money=zombies. Who knew that the room with pictures of people getting killed would spawn undead things trying to kill you?
The door that cannot be reached, the wall that cannot be climbed
What do you do when you're endlessly falling?
Now you're DMing with Portals!
It sure looks like a normal doorknob...Wait a second...Did it just move?!
Consider your grip and consider just how important the iron spikes and 10 foot pole are.
You find a book in the library, then when you start to read it, seems to change from pages of words to pages of images that seem to live and move. If you touch the page after the images appear, you travel into the story and now live in that world.
There is a book on that world, that leads back to this one.