Ran the boat onto a sandbar. Luckily, I was only at about 10 mph. As I jump into the water to set her free, Tow Boat guy comes over to render assistance and voila my inflatable PFD explodes. The tow boat capt. then looks at me and realizes that I'm the same guy who he helped w/ a sunken Scarab the summer before. Still looking for a cartridge for my PFD.