Marge: Bart, are you ready for your history test? Bart:

Marge: Bart, are you ready for your history test?
Bart: Oh, you bet, Mom! Ask me anything.
Marge: OK. Who was George Washington Carver?
Bart: Um...the guy who chopped up George Washington?
Homer: Really? Wow.
-- A learning experience for everyone,
"'Round Springfield"

Related:

• Jacques: First, you must get to know your lane. Feel the slickness,
  feel the slippery finish. Caresses it, experience it...
• Homer: How _could_ you?! Haven't you learned anything from that guy who gives those sermons at church?
  Captain Whatshisname? We live in a society...
• Marge: Bart, you said you were going to study. Bart:
  [clearly in pain] Oh! My stomach. Marge: Mmm, you...
• Bart: Wow, Mom, I never pictured you as any kind of authority figure before.
  Homer: Marge, I want you to take care of yourself out...
• Bart: Ma, could you get me some milk? Marge: [feeding Maggie] Can't you get it yourself?
  Bart: No, that's okay. I'll just go without liquid...
• Bart: OK! I won't bug Milhouse. But...well...Mrs.
  Van Houten, this is going to sound kind of...
• Homer: I'm going to regale everyone with my anecdote.
  You know, the one I tried to say on the radio? Heh...
• Lisa: Hey Mom, is this how you caught him? [throws Bart to the ground with his arm behind his back] Bart:
  [panting] Face it, Lis, you're too puny to -- aah!...
• Barbara: George, it's time to get dressed. George:
  N'uh huh. Not going outside today, not with those...