While it's true that (at least for some years) more people are killed by vending machine accidents than shark attacks, your personal risk depends on what you do. If you're a vending machine factory worker who never goes into the ocean, you're far more likely to be killed by a vending machine than a shark. But if you live in a part of the world that doesn't have vending machines and you swim in the ocean every day, the reverse is true.
You're scaring me! Just the thought of having a swim and then suddenly hearing a bag of chips getting stuck behind a glass panel sends shivers down my spine.