Broken Record: Mefirst's two heads can only say nonstop: "ME FIRST! ME FIRST! ME FIRST!"
Magical Incantation: To send Mefirst away, you must chant, "Mefirst, Mefirst, go away. That's not the way friends play." But since Mefirst is a two-word wizard, two words must be said at a time per person for the spell to work.