Merry

“The Midgard Serpent opened its mouth and swallowed the ox head. The hook dug into the gums of its mouth, and when the serpent felt this, he snapped back so hard that both of Thor’s fists slammed against the gunwale. Thor now became angry and, taking on his divine strength, he strained so hard that both his feet pushed through the bottom of the boat. Using the sea floor to brace himself, he began pulling the serpent up on board. It can be said that no one has seen a more terrifying sight than this: Thor, narrowing his eyes at the serpent, while the serpent spits out poison and stares straight back from below. It is told that the giant Hymir changed colour. He grew pale and feared for his life when he saw the serpent and also the sea rushing in and out of the boat.”
― Snorri Sturluson, The Prose Edda: Norse Mythology