I'm not sure what it is, but subways bring out the crazy in people. 

1. That hand is haunting. 

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FutureFormerRedditor

2. It's considered weird if your subway ride doesn't have someone upside down.

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trooper843

3. His facial expression says it all.

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marybanh

4. Step 1: Stop Reading This Book, Especially In Public

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hova414

5. That can't be healthy.

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dick-nipples