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A computer error leads to Arnold getting mail to sign up with the Selective Service System, even though he is too young. When Mr. Drummond complains, he is visited by the authorities, leading Arnold to think he will be drafted.
Willis lies to Arnold about knowing first aid in order to get a job at the school carnival, but when Arnold gets an electrical shock, Willis doesn't know how to save him. He later confesses to Arnold what happened and Arnold is angry when he finds out the truth.
Mr. Drummond's cousin Anna and her son Hans visit the family. As soon as they arrive, Hans starts causing trouble and blames Arnold and Willis for it.