A LOT Of Unanswered Questions Concerning This Man Riding On Top Of A Chicago Bus

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Every once in awhile you come across a video that leaves you with more questions than answers. This is one of them. 

I guess number one on the list of questions is how he got up there. I'm imagining a leap off a low bridge. I don't think a bus driver would miss someone climbing up the side of his bus but then again I'm no bus driver.

Another question is what's his escape route? Just hop down and run? He's probably more athletic than I am, but if I tried that I'd have at minimum a sprained ankle and I'm guessing there would be multiple broken bones.

Is this even illegal? I worked in Chicago for awhile and I never saw a sign prohibiting this. It's kind of common sense not to do this but is there an actual law on the books?

Hope the guy's ok. There are easier ways to avoid a 2 dollar bus fare.