Thanks to @willmccrabb, here's a photo of who George Lucas originally cast as Yoda in Empire Strikes Back. It's a monkey. A monkey in a mask. A monkey is a creepy, horrifying mask. This would have traumatized me as a kid if my dad hadn't already bought me a Hoth Han Solo for making me sit in the car while he banged his girlfriend.
To see a cute monkey with a cane, click more. You know you want more. Awww yeah, monkey with a cane.