Jim decides there's no use in stopping now. He continues to climb up his sister's thick blonde hair, holding on to a single strand as thick as a rope. He's terrified as she bounds around the house looking for him, but he finds that her motion causes her hair to sway back and forth, making it easier for him to continue to grab a handhold higher up.
Soon, Judy sits down to watch TV, right as Jim crests the top of her head. He takes a few steps to confirm that she can't feel him on her scalp, and then he sits down to take a breath. He is exhausted, but happy.
After a few minutes, he's relaxed and ready to go. But what to do next? Judy's show is so boring.