The Simpsons

S2E19: Lisa's Substitute

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Children, I won't be staying long. I just came from the doctor, and I have Lyme disease. Principal Skinner will run the class until a substitute arrives. What's Lyme disease ? I'll field that one. Lyme disease is spread by small parasites called ticks. When a diseased tick attaches itself to you, it begins sucking your blood, Oh !