In "One Summer: America, 1927," Bill Bryson explores the quirky traits of a character who possesses a limited sense of humor, often indulging in practical jokes that cross the line into cruelty. His antics reveal a troubling side of his personality, showcasing how humor can sometimes mask harmful intentions.

One particularly alarming incident involved him filling a friend's water jug with kerosene, leading to serious consequences when the friend unknowingly took a drink. This reckless behavior demonstrates the darker aspect of his humor, raising questions about the ethics of such jokes and the potential harm they can inflict on others.