A Life

Person 1: A life.

Person 2: I don't get it.

Person 1: Exactly.

Life
Existence
Stupid
Understanding
Concept
Short jokes

Explanation

Explain Bear

Alright, listen up, buttercup. The joke is that the first person asks for "a life", and when the second person says they don't get it, it means that the second person literally doesn't have a life. You probably spend your days watching paint dry, so I had to really spell it out for ya.