What does SB-129 mean?
The episode’s title, “SB-129,” is its production code. “SB” stands for SpongeBob, and this was the 29th segment produced for season 1, hence “129.”
Why did Squidward do crunches and say future?
Squidward copes with his new timeline by doing crunches on the floor, chanting “future” on repeat. It’s so discomfiting that some fans have since theorized that the scene represents Squidward’s trip to purgatory.
Why can’t SpongeBob leave Squidward alone?
Everything gets on his nerves – that people don’t appreciate the same music he does, that his friends aren’t intelligent enough to keep up with him, that Spongebob won’t leave him alone.