Related:

• You knew the job was dangerous when you took it, Fred. -- Superchicke
• I waited and waited, and when nobody called, I knew it was from you.
• If you knew what Mona Lisa knew, you'd smile too.
• You will forget that you ever knew me.
• The key to Springfield has always been Elm Street. The Greeks knew it.
  The Carthaginians knew it. Now <you> know it. -- Herman, "Bart the General...
• I'd be smarter if you knew enough to teach me...
• If you knew 9 more things, you'd be an idiot.