Some people just have no busines being in a boat or around boats. I fully believe in a qualification program based on boat size and power for recreational users. I have encountered far too many people that have the financial ability to purchase a $100K boat with twin 200's and lack the common marine sense it takes to get the boat off the trailer. My 3 passengers and myself in a 17 ft skiff were almost mowed over by a fat guy with his hat turned backwards. I was at slow speed hugging the dock pilings on the side of the waterway channel when he passed me just 10 feet away with his bow high while plowing. The channel was 75 yards wide, but he had to pass at 10 feet, gave me the middle finger and screamed that I should be going faster. He almost swamped me and shoved me into the pilings. I seriously thought he couldn't see me and was going to run me over as he approached before he passed and I had nowhere to go. This was very rude, void of adherence to ALL safe boating rules, horrible seamanship and extremely dangerous. My passengers were out of town guests of mine and they were terrified at this incident. We didn't go out again this weekend. This kind of situation is not that uncommon. I believe that required training and proof of qualifications would be of benefit here. I hope this lifeguard comes through everything okay and that the boater is fully prosecuted, especially for not returning to the accident in assistance and to accept responsibility.