There is another part of his story that he tells, that is quite interesting. It goes to show the being invisible still has it's dangers, and you have to be alert at all times. He is walking down a street and totally not paying attention well a man ran right into him and sent him into the road, where he was almost trampled by a carriage. I think if you were invisible it would be alot harder than being visible, because like in his story if you aren't paying attention for a second, something bad can happen. Also if you were paying attention and just walking and there are big crowds it would be hard to know which way to go so you don't get trampled by them.