In the middle of Chicago Union Station, a white door seemed to appear out of nowhere. Adjacent to the door was a sign with an appropriate message: "What is behind the door?" Bystanders stop and stare, while some venture over to the door, intrigued by the mystery. The video below features a variety of people observing the door before turning the knob to reveal the surprise. We particularly liked the brother who urged his sister to do the deed instead of himself.

This begs the question - would you open the door? What did you expect to be behind the mysterious portal? Let us know your predictions as well as your thoughts on the video. You can chime in down below or on Facebook. If the video put a smile on your face, be sure to share it on Facebook!