Peanuts by Charles Schulz for October 26, 1961
Transcript:
Lucy says to Linus, "You're at it again, aren't you?"<BR><BR> Lucy says, "'The Great Pumpkin rises out of the pumpkin patch on Halloween night, and flies through the air!' Good grief!"<BR><BR> Lucy asks, "How can you believe that? Linus says, "I have to believe it . . . I've already sent out fifty-seven pumpkin cards . . ."<BR><BR> Linus says, "It would be economically disastrous for me not to believe it!"<BR><BR>
The sunk cost fallacy.