A roc! You walk around, with your new roc pet, which turns out to be a highly dangerous and uncontrollable bird that eats anyone that walks around with it. As it is a legendary bird of prey, naturally, it eats you. What else? First, it eats your body, bit by bit. It rips off your legs, chews on it, and spits out the bones. Same thing with your other leg and your arm. The entire time, you’re alive, and you are writhing in pain. Then, it chews on the rest of you, until there is just your head left. It eats your head whole. What a painful death.
I wish for a pet rock.