This article is pretty telling.
The most common mistakes boaters made while at the helm of their boats include running aground as well as getting a line caught in the propeller (both 15 percent). Twelve percent of boaters admit they couldn't restart their boats because they accidentally left the kill switch on.
Fortunately, some of the most painful mistakes are also the least common. Two percent of boaters say they've dropped an anchor on their foot, and one percent of boaters admit they've run over someone's foot because they were not paying attention when driving their trailer out of the water. But one mistake that can cause a fair amount of discomfort affected almost half of all boaters: 40 percent of boaters say they've gotten a bad sunburn while out on their boats.
Losing items overboard isn't necessarily painful, unless, of course, you're like the 2 percent of boaters who have lost wedding rings! The most common items lost overboard are hats (52 percent); sunglasses (46 percent); fishing gear (39 percent) and towels (23 percent). When asked to provide write-in answers for items lost overboard, one boater said he'd lost teeth and another said he'd lost a hearing aid.