S1, E6: Cowbella is afraid to go to sleep because she might have a bad dream, so the Pajanimals go to the Friendly Forest to meet Jerry, who assures her that those bad thoughts are just from her imagination. He also explains that if your imagination can make scary thoughts, it can also make happy thoughts. When they go back home, Cowbella lists all her “happy thoughts” while falling fast asleep, ready for a night of sweet dreaming.