 In the scene where Kuzco and Pacha are searching through the various  potions, Pacha says, "Lions, tigers, bears" then when they come upon  the potion for humans, it is missing and Yzma says "oh my." Together  this creates a line from _Wizard of Oz, The (1939)_ (qv). According  to producer Randy Fullmer (qv) and director Mark Dindal (qv),  they were forced to use this joke, which they detested, by then