Not today, shark!
Sea Turtle Avoids Predation By Tiger Shark By Barrel-Rolling, Using Shell As Defense

Because Mother Nature is a real firecracker, this is a video of a sea turtle thwarting a tiger shark’s efforts to make it into a meal by constantly turning and barrel rolling to make sure whenever the tiger shark attacks it’s presented with the full length of its unbiteable shell. Who would have ever thought that shell would come in useful? As far as defensive maneuvers go, this is a smart one, and I wouldn’t be the least bit surprised if it picked up this up at one of Master Splinter’s weekend-long self defense seminars.