bridges and bikes

On our bike ride this past Saturday, while crossing the Williamsburg Bridge, the boy and I had a particularly entertaining New York moment. We passed a man, who may or may not have been homeless, riding a unicycle. And not just a normal, run-of-the-mill unicycle, but a seriously tall, like 7 feet in the air, unicycle.

I wish we had our cameras on us at the time. It would've been priceless.

Two questions: 1) how did he get on the unicycle? and 2) how did he manage to pedal up the upwards part of the bridge? (The second question is really more out of pure envy since on a regular bike, I feel like I'm going to have a heart attack by the time I reach the mid-point of any bridge.)