Ok, heres my idea for a SB episode:
Title: Spongebob's First Roller-Coaster Ride
Story: Patrick invites SB on a trip to an amusement park, but SB trys to make up a bunch of execuses to get out of it. Pat later finds out that SB is afraid of roller coaster rides, and has never been on one before. SB agrees with Pat's idea to try to teach SB about roller-coasters and train him to get ready for the Amusement Park.
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What do you think? Let me know if you want it to be a fan-fic.