It's traumatic when a player leaves a gaming group. The dynamic changes, their character has to vanish (or be taken over by the GM as an NPC), and there's potentially a hole left in the skill set of the party.

So everyone's always happy when an old player returns!

Transcript

C-3PO: You can't just walk in here after two years and sit down and start playing the game again!
Obi-Wan: Sally, calm down, there's a lot—
C-3PO: Where! The! Hell! Have! You! Been?!
Obi-Wan: I'm sorry I didn't call. I did email.
C-3PO: One email! "I'm fine, I'm travelling." That's it!
Obi-Wan: I needed to rethink my life.
Captain Antilles: {dead} Cool. What did you learn?
Obi-Wan: To know and trust my instincts.
Captain Antilles: {dead} Yeah. Chocolate dice. Etcetera.
Obi-Wan: Indeed.
R2-D2: Yeah, this is nice and all, but the important thing is: the group is back together.
R2-D2: The circus is now complete.
Captain Antilles: {dead} When you left, you were but the learner; now you are the master.