The key to Springfield has always been Elm Street. The Greeks knew it.

Related:

• Herman: The key to Springfield has always been Elm Street.
  The Greeks knew it. The Carthaginians knew it. Now...
• I always knew you had personality. The doctor said it was hyperactivity,
  but I knew better. -- Homer is pleased that Bart's...
• If you knew it,
  when did you know you knew...
• Herman: How many men do you have? Bart: None. Herman:
  You'll need more. -- "Bart the...
• Herman: [whispers] What's the password? Grampa: Let me in,
  you idiot! Herman: Right you are. [opens the door]...
• Boy: [mopping] Hey, did you guys just come from the prom?
  Bart: Sort of. Marge: But, you know, we realized we're...
• Bet you can't stop reading here <---
  I knew it.....
• Kent: We've just received word of a high-speed desert chase.
  The suspects have been identified as Ruth Powers...
• Lawyer: I intend to prove that Freddy Quimby is totally innocent!
  First of all, his accuser is a very shady character...