An old joke that my grandad told me. A rich man had invited a group of friends to his home for dinner. He was very much looking forward to this, but there was one problem: he had a horrible cold, and his nose was running. He said to his butler, 'Oh Butler, what shall I do? I cannot have my nose running everywhere while there are guests here?', to which the butler replied, 'I have an idea. If your nose is running, I will say 'Johnson's at the door, sir,' and that will give you an excuse to leave …