Curious People Who Open This Door Are In For Quite A Surprise (Video)

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I don't know who set up this prank or why -- or even how -- but I do know it's the best thing I've seen all week.

Pedestrians passing through Chicago's Union Station were baffled to see a mysterious door had popped up in the middle of the concourse.

Behind the door was a tiny, thin room, perhaps only big enough for a person. A sign beside the strange portal simply read: “What is behind this door?”

The brave souls who dared open it were blessed with the cheeriest surprise you'd never expect -- see the video up top to discover the door's contents for yourself.

Citations: Would You Open This Door (A Plus)