Waterspout are exactly what they look like, and exactly as awesome as they sound: they’re tornadoes that form over water. Because of this, they don’t pose a major threat unless you happen to be in a boat—but if you are, then watch out, because these things can achieve speeds of up to 190 miles (305 kilometers) per hour. In fact, it’s been speculated that many mysterious shipwrecks—such as those within the Bermuda Triangle—are simply a result of bad luck with waterspouts. They can occur anywhere over water, but are especially prevalent in the Florida Keys, where there can be 400 or 500 waterspouts a year.