Look at my eyes! See the sincerity? See the conviction?

Related:

• You wanna be held back a grade? Concentrate, man! -
  Bart, slapping himself, trying to study, "Bart...
• As God as my witness, I can pass the fourth grade! -
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• Otto: Get off the bus or forever hold your peace, little dudes!
  Bart: Otto, you know I respect you. I mean, you always...
• Just look at the X-rays! You see that dark spot there?
  Whiplash. And this smudge here, that looks like my...
• I have to pay to see my own grandson. That's the Democrats for ya.
  Abe, fierce Republican, "Bart Gets...
• Martin: [takes a seat at the front of the bus] Bart:
  No! Martin: No? Bart: Only geeks sit in the front...
• Milhouse: This is Becky. She's in the second grade.
  Bart: Hi, Becky, thanks for coming out. [signs her...
• You just need to develop a callous. [pricks her finger and lights a lighter under it] You see?
  Now <that's> a sewing finger, honey. -- Marge...
• Bart: Um, say, is there anything I can do to avoid coming back here?
  Satan: Oh, sure, yeah. But, eh, you wouldn't like...