This cartoon shows two classmates playing catch. One of the students says to the other, "Hey Patty, Do you want to play ball?" Patty responds by using her hands positioned on her head to nod "Yes." Two teachers are in the foreground one asks the other, "What's that odd behavior?" The other says, "She's nodding YES. Those are the physical prompts I used." The tag line under the cartoon reads, "Patty's teacher returned the book on applied behavior analysis before he had a chance to read the chapter on fading physical prompts."