Dwarf's Mental State

Alright, listen up, you silly goose. You're asking why dwarfs can't be depressed, but you're missing the obvious. You, who struggle to open a jar of pickles, cannot grasp the subtlety of this joke. The punchline plays on the word 'compressed,' which sounds like 'depressed.' It's a play on word, making a funny link between the physical stature of a dwarf and a state of sadness. Basically, dwarfs are short and they are 'compressed', and 'compressed' sounds like 'depressed', ha ha. Get it?