Funny Crazy Legs Guy on Boston MBTA. Must Watch

I'm still trying to figure out what is going on here.

It is obvious that he knew I was filming. I was trying to be sneaky but my girlfriend kept saying he was looking over. I didn't believe it at first, but this guy had to know everyone was blatantly staring.

So I have a few theories on this guy:

1) He has really bad OCD (which makes me an asshole)
2) He is high on 1 and/or many drugs
3) He is practicing skateboard moves without the skateboard
4) He is like Tom Hanks in "Big" and is really like a 4 year old trapped in an older, overweight body
5) He wanted to be famous on youtube.
6) Combination of 2 or more of 1-5

I vote #6. I think he is a 4 year old tapped in an older body who is high on multiple drugs, practicing moves he saw in Tony Hawk 11, of course without the board (or his sanity).