A Bit Extravagant

Came across this today in Robert Burton's The Anatomy of Melancholy: One supposeth himself to be a dog, cock, bear, horse, glass, butter, etc. He's detailing the symptoms of melancholy, more specifically Extravagant Humours. Difficult to think of anything more extravagant than a chap thinking of himself as butter, though it's the etc in the list I love. So many possibilities...