I was born and raised in Oklahoma and have spent a ton of time on its lakes. The most likely reason that the mortality rate is so high for swimmers isn't because there is a horse-sized octopus on the loose, but because the average person at the lake sucks down around a case of Bud Light throughout the day.
But my poor home state needs all the tourist dollars it can get (somehow the World's Largest Praying Hands in Tulsa or the Cow Chip Throwing Capital of the World monument in Beaver aren't packing 'em in like they used to), so I'm going to throw all those arguments to the side. There is a huge, man-eating octopus in Oklahoma, and you should totally drive your family down to catch a glimpse of it this summer. Remember to buy a couple t-shirts.