Because it had its in-de-pen-dance. I'm posting lots of really bad jokes tonight that just appear in my head, if just one person enjoys just one joke is worth it, good evening.
Tattooine.
Because he kept running out of the pen.
Because it was always running out of the pen.
Because it came out of the pen.
I LITERALLY CAN'T EVEN WRITE NOW
It's mother was in the pen and it didn't know how long the sentence was.