One of my entries for the All Yesterdays Contest [link]. Here, a large theropod (Mapusaurus) ins't hunting in a powerful chase, roaring and at high velocity, but in a dissimulate way. It's pretending to limp, lowering the body, its patterns even simulates a large wound, and it is hiding the teeth under the lips (to looks even more harmless). Doing this, the Mapusaurus fools a smaller carnivore (Skorpiovenator, in this case), making it believe that the carcharodontosaurid is an easy, injured and inoffensive prey. Then, when Skorpiovenator is close enough, the Mapusaurus will suddenly attack. These patterns also would benefit Mapusaurus in comunicating with others from its species (in display, for example), and isn't a true problem for hunting herbivores. If Mapusaurus was indeed a sauropod hunter, it would haven't problems in chase and catch one of these slow giants, if they flee.
Interesting concept. I admit I'm not sure if Mapusaurus was smart enough to invent this sort of hunting, but why not? It certainly apears to be working.