Jellyfishing / Plankton! - S1-E3
Plankton: Hear me Krabs, when I discover your formula for Krabby Patties, I'll run you out of business. I went to college!
New Student Starfish / Clams - S3-E14
SpongeBob: You got me in trouble! You got me moved to the back of the room! It cost me one of my good noodle stars!
Patrick: Who cares about a stupid star?
SpongeBob: Gee Patrick, it seems like you would care a lot about stupid stars, considering you are one!
Dying For Pie / Imitation Krabs - S2-E6
Mr. Krabs: What's the most important rule here?
Spongebob: No free napkins?
Mr. Krabs: No, the other most important rule!
Spongebob: Only discuss the secret formula with Mr Krabs.
Mr. Krabs: As long as you do that, the formula is safe.
Squidward: I thought the most important rule was why do today what you can put off for tomorrow?
Mr. Krabs: But what's today, but yesterday's tomorrow?
Squidward: What?
Chocolate With Nuts / Mermaid Man And Barnacle Boy V - S3-E11
Spongebob: Quick, Patrick. If you could have anything right now, what would it be?
Patrick: Um...more time for thinking?
Spongebob's Last Stand - S7-E22
Mr. Krabs: Alright, Plankton! It's Eugene Krabs, here, with, What's-His-Name! Now come on out!
Plankton: I can't.
Mr. Krabs: Come on outside, and take what's coming to you!
Plankton: I really can't come outside!
SpongeBob: Why not?
Plankton: Because I'm already out here, you bumbling bottom feeders! Open your eyes for crying out loud!
MuscleBob BuffPants / Squidward, the Unfriendly Ghost - S1-E11
Squidward: Spongebob, are you trying to drive me to the nut house?
Spongebob: No. Just into this hole.
Mermaid Man and Barnacle Boy / Pickles - S1-E6
SpongeBob: Wow, Mermaidman and Barnacleboy.
Patrick: It's too bad they're old.
SpongeBob: What do you mean, Patrick? Old people are the greatest. They're full of wisdom and experience.
Mermaid Man and Barnacle Boy / Pickles - S1-E6
Mermaidman: To the meatloaf! To the broccoli! Make sure you give extra broccoli to my young ward. The boy needs his vitamins.
SpongeBob SquarePants: I'm every bit as good as Larry, and if I'm not, then may I be struck by...
[Rumble of thunder.]
SpongeBob SquarePants: ... A flying ice cream truck.
[A shadow forms over SpongeBob.]
SpongeBob SquarePants: And live!
The Graveyard Shift / Krusty Love - S3-E13
Squidward: Years ago, at this very restaurant, the hatch-slinging slasher used to be a frycook, just like you. Only clumsier! And then, one night, when he was cutting the patties, it happened...
SpongeBob: He forgot the secret sauce?
Squidward: No.
SpongeBob: He didn't wash his hands?
Squidward: No!
SpongeBob: Irregular portions?
Squidward: NO! He cut off his own hand! By mistake!
SpongeBob: You mean like this?
[At every 'this', SpongeBob removes his arm and a new one grows back.]
SpongeBob: Or like this? Or this? Or this? But what about this? Or this? Or this? Or this?
Squidward: Except he wasn't a sponge!
SpongeBob: So?
Squidward: So it didn't grow back!
Help Wanted / Reef Blowers / Tea at the Treedome - S1-E2
Mr Krabs: Do you smell it? That smelly smell. The smelly smell that smells...smelly.
Valentine's Day / The Paper - S1-E16
Patrick Star: You broke my heart! Now I'm gonna break something of yours!
Mr. Krabs: The health inspector is here! If he finds one health violation, he'll shut us down for good! We've got to do everything in our power to make sure he passes the Krusty Krab!
Spongebob Squarepants: But, Mr. Krabs, there's nothing to worry about. The Krusty Krab is the most perfect place in the universe.
Mr. Krabs: You really haven't got any brains at all, have you, son?
[Spongebob and Patrick have just been fried by Man-Ray.]
Patrick Star: What's that smell?
Spongebob Squarepants: That, Patrick, is the smell of defeat.
Patrick Star: Oh, good. I thought it was my skin.
Spongebob Squarepants: Oh, Gary! Why didn't you tell me I was pushing you too hard?
Gary: Meow!
Spongebob Squarepants: You did? Oh, Gary! Why didn't you tell me I wasn't listening?
Gary: Meow!
Spongebob Squarepants: You did?
Spongebob Squarepants: We're not doing so well, Patrick. We need a new tactic.
Patrick Star: I got it! Let's get naked!
Spongebob Squarepants: No, lets save that for when we're selling real estate.
Spongebob's Last Stand - S7-E22
Mr. Krabs: Come on, lad. Let's go give that Plankton a piece of our minds.
[SpongeBob literally rips out a piece of his head.]
SpongeBob: Think this piece should do the trick.
Answer: I believe this is the Season 6 episode "Spongicus".