Guinness found a rock that he was convinced was edible; the veritable holy grail of beach flotsam. He tried to rescue it, but was not successful. He tried so hard.
He tried so hard, he submerged his whole head up to the ears. And this is my dog that hates water with a Danish passion. He tried, then finally got his teeth on the damn thing, and instantly dropped it, with dismay, as he confirmed it was in fact a rock and not a giant sticky bun submerged in a tide pool. Then he pouted.