(3) He is only 3 feet tall (and the bravest little hobbit of them all...)
(4) You require the player to hum a tune when his PC Bard sings in combat (because you're a Role Playing Snob), and he belts out the "Lollipop Guild" song from the Wizard of Oz.
(5) While travelling on the plane of Oz, said player uses his +5 Vorpal Lollipop of Plot-Essential NPC Slaying to lop off Dorothy's head and steal her ruby slippers.