" As the message drained away Vimes stared at the opposite wall, in which the door now opened, after a cursory knock, to reveal the steward bearing that which is guaranteed to frighten away all nightmares, to wit, a cup of hot tea.*
* The sound of the gentle rattle of china cup on china saucer drives away all demons, a little-known fact. "

― Terry Pratchett , Snuff (Discworld, #39; City Watch #8)