There once was a man, who usually went to the bar on Sundays, and drank. But one..................How was this possible?

Question

There once was a man, who usually went to the bar on Sundays, and drank. But one particular Sunday, the man was drunk when he came across a rich man staring at an old bridge. The bridge was full of dirt, sod, and bugs. The rich man then saw that the drunk man was going to cross the dirty bridge. The rich man told him, "That bridge is so dirty, nobody wants to cross it. If you can cross it, without any part of your body touching it, I will pay you $1,000. If you do touch it with any part of your body, then you will have to pay me $100." Being drunk, the man agreed, but then suddenly realized what he was agreeing to. But then, he thought of an idea, and then crossed the bridge according to the rich man's rules, and later returned home $1,000 richer.
How was this possible?

Answer 1

I think its just because of the fact that his shoes are not technically a part of his body that he won the bet by simply walking across the bridge to cross it.

Answer 2

He walked over the bugs, thereby not touching the bridge.

Answer 3

He may had used the sod laying on the bridge, and walk over that or used those sods as shoe cover and then walked across the bridge