"I'm ready!" is SpongeBob's catchphrase. It is used to reflect the character's optimistic personality and is commonly said whenever SpongeBob is walking to work or prepares for what his adventures will bring him. It is first said in the pilot episode "Help Wanted."
"Help Wanted" - SpongeBob marches to work; SpongeBob marches to work again after Patrick boosts his confidence.
"Boating School" - SpongeBob walks to Mrs. Puff's Boating School.
"Hooky" - SpongeBob walks to work.
"Patty Hype" - SpongeBob puts up an "Open" sign on the Pretty Patties Stand; phrase is said by elderly Dream SpongeBob.
"Prehibernation Week" - A fish is turned into the shape of SpongeBob and copies his catchphrase.
"Krusty Krab Training Video" - SpongeBob is so eager to make a Krabby Patty that he splits himself into duplicates that mimic his catchphrase.
The SpongeBob SquarePants Movie - SpongeBob walks to the grand opening ceremony of the Krusty Krab 2.
"Bummer Vacation" - SpongeBob prepares for his vacation.
"Truth or Square" - Phrase is repeated by SpongeBob throughout the song "Rubber Horse Rag."
"Stuck on the Roof" - SpongeBob after making his kitchen on the roof.
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A sound clip of SpongeBob saying this catchphrase was sampled in the 2013 AJR single of the same name.