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Barrett has been trying to salvage any use for his arm by tattooing it with interesting artwork. John has a burning question which he DEMANDs Barrett to answer, even if the answer is impossible to come up with. The boys then get a letter from Amy G Dala, who is having a big problem with her 'breathing' head. Can Barrett and John work out why her head is overly large in the morning, and crinkly at night? Finally, Barrett becomes something he never expected: a cop. He helps Billy the Bobby try to calm two old men down, who have trapped themselves together using a Chinese finger trap. Can Barrett help Billy cut them loose?