Chester A. Arthur's head

Chester A. Arthur was a U.S. president in the 19th century. In the 31st century, he lives at Head Museum along with the other former U.S. presidents.

During the Brainspawn's attack on Earth, Philip J. Fry used the H2OGfat from Arthur's jar to put out the fire on the Professor's arm.

Arthur's head also appears in the front row of Fry's Funeral, along with Guenter and the main cast.

Production
It is noted in the commentaries for "The Day the Earth Stood Stupid" that the line "Chester A. Arthur fell down" originally was "Chester Arthur fell down", but the A made it sound much funnier.