Related:

• I can only tell you that I sincerely wish that I didn't know now what I didn't know then.
• I can say with confidence I know a fair bit about LSD. -- Dan Rathe
• Are you a parent? Do you sometimes find yourself unsure as to what to say in those awkward situations?
  Worry no more... Do as I say, not as I do. Do me a favour and don't tell me about it....
• I know and I know you know I know.
• If I don't know your name, how am I supposed to tell my diary about you?
• Don't I know you?
• Homer: Hey, why don't I apply at the nuclear power plant?
  I hear they pay pretty well. Marge: I don't know....
• I don't know what's wrong with people! All I ask them to do is exactly what I tell them.