Peanuts by Charles Schulz for December 01, 1966
Transcript:
Snoopy thinks from inside the mailbox, "What would happen if I just laid here real quiet . . . "<BR><BR> Snoopy thinks, "And when the mailman came along, I suddenly leaped out . . . "<BR><BR> Snoopy leaps out and bares his teeth!<BR><BR> Snoopy goes back inside and thinks, "It's worth thinking about . . . "<BR><BR>
His face would be bitten off.