Jackassaniacal (JAK-ASS-A-NIAH-KAL)
Someone who lives their life like a joke and thinks everyone else is the punchline.
My dog is a Jackassaniacal. He once chased a vacuum cleaner like it was a monster.
I'm a Jackassaniacal. I once tried to eat a whole pizza in one bite and failed.
My friend is a Jackassaniacal because he once tried to teach a goldfish algebra.