I know there's one of these for The Simpsons, but I'm not sure about Spongebob yet. You just say a word that has a lot to do with the word the last person posted. Here's an example:
Person 1. Spongebob
Person #2: porous
Person #3: absorbent
Person #4: sweat
Person#5: sweats a lot
Person 6: Mr. Krabs
... and so on. Also, always quote what the last person said. That way, you can see what words/phrases have already been mentioned. This is good because you're not allowed to say a word that has already been posted. I'll start.
1. Spongebob