Peanuts by Charles Schulz for October 26, 1952
Transcript:
Snoopy wears a mask. One person has a jack-o-lantern on his head, another wears a sheet and an old hat. The pumpkin asks, "Ready?"<BR><BR> "Let's go..." the jack-o-lantern adds as the three costumed figures set off together through some trees.<BR><BR> They walks along.<BR><BR> "Boo!" the ghost throws out its arms as Lucy walks past. She ignores him.<BR><BR> "BOO!!" the jack-o-lantern cries. She ignores him, too.<BR><BR> "BOO!" Snoopy barks at Lucy's back.<BR><BR> All three turn and sigh dejectedly.<BR><BR> "BOO!" Lucy cries from behind. All three jump, thoroughly startled.<BR><BR>
Did Snoopy actually speak here? He wasn’t depicted with a thought balloon but a normal speech balloon like the others.