Did you know that once you enter the Muppet Vision 3D building in Hollywood Studios, you will see a Box Office with a sign that reads “Back in 5 minutes – key is under mat” and if you lift the mat, you will actually find a key embedded in the carpet?
Disney World Enthusiast 
Awesome. I have to try that one.
I love how Disney hides little details like this one in their parks! 🙂
Just like a Hidden Mickey but a little different. They go a long way to add these details and they are neat.