A doctor's toilet was blocked so he rang the plumber. The plumber said: "It's the early hours of the morning, can't it wait?" The doc said: "If you were ill I'd have to come out". The plumber said: "Fair enough" and called at the docs. He lifted the toilet seat, threw in two paracetamol and said: "Give it a few days and if it's still the same give me a call"