Legionnaires

Me: Your granddaughter is going to parliament to watch a debating competition. Mum: Where? Me: Parliament. Mum: London? (smiling) Me: No, Edinburgh. Mum: (frowns) Ah widnae go to Edinburgh just now. Me: Why not? Mum: ‘Cos of that Legionnaires disease. Me: It’s not catching… Mum: (raises eyebrows)