Peanuts by Charles Schulz for March 04, 1966
Transcript:
Snoopy lies on the doghouse with a birds nest resting on his stomach. He thinks, "How do things like this happen to me?"<BR><BR> Snoopy thinks, "I'm too easy going, that's why! I should have said something as soon as that stupid bird started to build this nest . . ."<BR><BR> Snoopy thinks, "The next thing you know there'll be . . ."<BR><BR> Two baby birds poke their heads up from the nest and Snoopy thinks, "I knew it!!"<BR><BR>
Schulz describes this as Woodstock’s introduction in an essay he wrote for TV Guide, published February 23, 1980