Don't Be Overconfident

"Simba, being brave doesn't mean you go looking for trouble."

- Mufasa

In many a story, there comes a time when the hero/heroine becomes overconfident, especially when it comes to these circumstances: In other words, the hero is so full of himself or super-excited about doing something that he's unaware of the sticky situation and/or trouble he's about to get into, an impending problem, or all too smug to notice the tiny details right under his nose.
 * Willing to prove his worth
 * Believing he/she is doing the right thing
 * Believing he/she is a hero
 * Daring to carry out a heroic deed and/or doing so
 * Being excited about something

Noteworthy Examples

 * After Judy Hopps captures Duke Weaselton, she is super excited and overconfident after doing so, but unfortunately, she is unaware of the trouble she's about to get into with Chief Bogo after her actions caused a panic in Little Rodentia.
 * In Gerald's Tonsils, Gerald is excited about performing in the school concert, but is unaware that he's about to get tonsillitis.
 * Captain Underpants becomes so full of himself with his "super powers," believing he's saving lives, but he forgets to look before he leaps and makes the mistake of punching a mime.
 * Simba makes the mistake of being overconfident by going into the Elephant Graveyard with Nala, unaware of the trouble he's about to get into - a run-in with the hyenas and getting in trouble with his father for disobeying him.

Quotes
"(After rehearsing for the school concert, Gerald and Arnold walk to Gerald's house.) I tell you, Arnold, EVERYONE'S gonna be there! The families, the neighbors, everyone comes to the Spring Concert. (Harvey: The Spring Concert? I never miss it. What's your class gonna sing this year, boy?) (Arnold: Gerald's got a big solo on the end of "Moonlight Bay.") (Harvey: Really?) That's for one reason NOT to miss it, Arnold.) (Harvey: Better take care of that voice, Gerald.) Ah, don't worry. NOTHING'S gonna happen to my voice. (But unfortunately, he's wrong. Scene cuts to a health clinic, where Dr. Steiglitz looks down Gerald's throat with a tongue depressor.) A-a-a-a-ahh... (Dr. Steiglitz: Oh, those tonsils are really enlarged, Gerald. (He removes the flat stick from Gerald's mouth.) I think we should take them out. This week.) Take 'em out?! This week?! Why?! (Dr. Steiglitz: Well, Gerald, you've complained of sore throats several times this year, and I think your tonsils are the problem.) But I have a big solo in the school concert, and it's in two weeks! (Dr. Steiglitz: Then let's do it tomorrow.) Aw, man! I've never had an operation before! (Dr. Steiglitz, washing his hands: Oh, it's very minor surgery, Gerald. You'll be in and out in one day.) (Gerald's Dad: Don't worry, Gerald. I had my tonsils out when I was eight, and it wasn't bad. I remember they gave me all the ice cream I could eat. You still do that?) (Dr. Steiglitz: All the ice cream you can eat.) (Scene changes to a hospital, where Gerald is in bed.) (weakly) All the ice cream I can eat... I wanna eat all this ice cream. My throat is killing me. (Arnold: How long till you get your voice back?) Doctor said a couple of days."

- Gerald being overconfident about singing for the school concert, unaware that he's getting tonsillitis. "(After capturing Duke Weaselton, Judy rolls the tied-up robber to Clawhauser's desk. She bravely plants her fists at her sides.) I POPPED the weasel! (Just then, a loud yell rings out.) (Chief Bogo, breathing fire: HOPPS!) (Judy looks up, and sure enough, it's Chief Bogo, who sends her to his office.)"

- Judy Hopps being overconfident after having captured Duke Weaselton, unaware of the trouble she's about to get into with Chief Bogo. "(Captain Underpants notices a mime performing.) What is this? (He rushes over to him, noticing his act.) Poor soul. You're trapped in some sort of box-like prison! (The mime pretends to pound on the glass and call for help.) What's that? I-I can't hear you! (The mime makes a crying gesture.) But I see your tears. (George and Harold come running over. Harold laughs.) (Harold: Is it okay that I'm kinda loving this?) (George: Yes and no. But mostly yes.) (They both laugh.) (bravely) Fear not, I will set you free! (With a mighty blow, Captain Underpants decks the mime right in the nose, knocking him to the ground!) (Mime: OW!) (With that, George and Harold look away.) (Mime: What is WRONG with you?!) (The mime rubs his sore nose.) Oh, that's better. I can hear you now. (Harold, giving the mime a coin: Sorry, sorry, we're so sorry.) (George turns to Captain Underpants.) (George: Okay, listen, let's not be punching people, though, because...) (Our hero hears a distressed meow.) Hold it. (He turns around and notices a cat stuck in a tree, with an old lady reaching for it.) Here, let me help. (He grabs the woman and throws her up into the tree.) You're welcome, madame! (George: Wow, he is SUPER dumb.)"

- Captain Underpants being overconfident about being a superhero, which gets him into trouble with a mime.