RedactedNarrative: At approximately 0730, Operator was fishing from his vessel, in Lake Pontchartrain near the I-10 Twin Span. Operator reached across the console and started the engine and then began to walk around the console at which time his long sleeve shirt cuff caught the throttle and placed the engine in gear at a fast speed.  He was thrown overboard and his vessel began circling and struck the bridge pilings multiple times. no kill switch. The hull of the vessel sustained severe damage and capsized.  Operator was able to swim to safety and be rescued by another boater.  Alcohol/drug use is not suspected to be a factor and all PFD requirements were met.