Sore throat
From Tardis Wiki, the free Doctor Who reference
Whilst disguised in the skin suit of Lord Mayor of Cardiff Margaret Blaine, Blon Fel-Fotch Passameer-Day Slitheen claimed to have a sore throat or "just a little tickle" when Cathy Salt questioned the change in her voice after the Raxacoricofallapatorian disrobed behind the door of a ladies toilet, breaking into a fake cough to keep the deception. (TV: Boom Town)