The fact that Squidward thought Spongebob was a ghost was too funny. That must be my only favorite part in that episode.
"Ah! Ghost! I'm sorry I was so mean to you while you were alive, please don't haunt me!"
"I'm not a ghost, Squidward, I used Patrick's tanning booth and I stayed under too long. [laugh]"
"Oh, this is too precious! You're sun bleached! Looks like you won't be at the party."