Patsy, the cook of the "Flying U" ranch, is passionately fond of canned corn. Every time he goes to town to buy supplies for the camp, cases of canned corn head the list. Patsy may forget at times to order a special brand of tobacco for the boys, or some of the trimmings that go to make a camp dinner more acceptable, but he never fails to order the canned corn. Every day for breakfast, dinner and supper, the big kettle of canned corn forms the principal article of diet. The boys being "good fellows" stand this for a long time until they feel that they cannot accept corn as the main article of diet any longer. Then they revolt and refuse to be served from Patsy's huge kettle any more. Patsy is sensitive, and his feelings are hurt, but his appetite for canned corn is still unimpaired. After the boys walk out on him and scorn the breakfast of canned corn, Patsy retires to the cook tent with the kettle and gorges himself to repletion from its contents. The boys are sore and hungry, but they leave the camp for the range to perform their regular day's work. As the boys disappear in the distance, Patsy is taken with terrific cramps. He has a horrible suspicion that he has been poisoned. His examination of the empty corn cans suggests ptomaine poison. The camp is deserted and the boys will not return until five o'clock in the evening. Patsy spends hours of agony and realizes that he has had too much of a good thing. After a day of suffering, the boys return to camp. No dinner in sight. Patsy is discovered groaning in pain. They realize his desperate condition. They are glad that Patsy has had a lesson, but do not want him to die. Weary, one of the boys rides off to town to get a doctor, while the rest prepare the supper. After many adventures with the doctor who is in no condition to travel, Weary brings him to camp. In the meantime, a good Samaritan, a stranger with a big whiskey bottle, has doctored Patsy with liberal decoctions of liquor, so that the doctor's services are not required. All decide to climb on the "water wagon."