Even though this is probably true, I'm pretty sure she meant the sharks that eat meat. You got a little too specific, and the sharks as we all usually know, are the ones who fiend for blood and eat meat, and people in some cases. I vote for Skyerine because, imo, a shark eating vegetables is rarely seen, and I don't believe there are vegetables growing in the ocean, anyways. It's very well done, also.
As for the other entries, angels are sorta cliche, and well, people believe in angels so I wouldn't quite call them impossible. There's a whole religion based on God and his angels.. and such, and usually people see what they want to see, because their beliefs and thoughts are mixed into what they want to see. Terroryst's entry was pretty good, also. I didn't pick it cause, well Spiderman's a super-hero, and the belief of not being able to save everyone, shows up in like, every movie revolving around a super hero.