Homer: I'm just a big fool. Karl: Oh no, you're not.

Related:

• Homer: I'm just a big fool. Karl: Oh no, you're not!
  Homer: How do you know? Karl: Because my mother taught...
• Homer: [picks up a note] Karl's voice: Dear Mr. Simpson,
  I've taken the liberty of preparing your speech...
• Karl: You don't belong here. You're a fraud and a phony and it's only a matter of time until they find you out.
  Homer: (gasps) Who told you? Simpson and...
• Karl: You don't belong here. You're a fraud and a phony,
  and it's only a matter of time until they find...
• Mike Scioscia: [pushing a wheelbarrow of glowing green goop] Karl:
  [pulls up beside him with his own wheelbarrow of glowing...
• Len: Hey, big fight coming up. Karl: Yea, you wanna come over to my house and listen to round-by-round updates on the radio?
  Len: Oh, yeah, okay. Oh, and then after the fight...
• Karl: Hey, way to save our lives! Len: Yeah, we owe you one!
  Homer: Yeah, you know, boys, a nuclear reactor is a...
• Len: Those lousy Germans can't fire me. I'm the only one knows how to unjam the rod bottom dissociator.
  Karl: Well, they can't fire me. I'm the only one...
• Homer: [scarfing down donuts] Lenny: Hey, Homer, slow down.
  You're going to choke or something. Homer: Don't tell...