Peanuts by Charles Schulz for October 22, 1965
Transcript:
Linus looks at an empty plate and says to Sally, "Ask Lucy who took the lsat piece of cake."<BR><BR> Lucy sits watching tv and says, "Tell him what he doesn't know won't hurt him . . ."<BR><BR> Sally walks back to the kitchen.<BR><BR> Sally says to Linus, "What you do not know will not do you any physical damage!"<BR><BR>
I think that’s a threat.