Similar to what Squidward did in "Nature Pants," in "Club Spongebob" he says "Why must every 11 minutes of my life..." 11 minutes is the average length of a Spongebob episode. See more...
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Updates: Series 2
Continuity: In "Where's Gary?" the length of the paddle ball string that SpongeBob uses seems to vary in certain shots. While the length is somewhat subjective one shot that is more conclusive is when Patrick finds Spongebob lying on the floor. The string on the paddle ball is fairly short. When the two get up to get a glass of milk, the string is now a lot longer.