wwyd if you had been in a (famous) London restaurant, with guests, when at the end of a meal, something caught your eye under the (now vacated) table next to you, and there's a mouse scampering around? No-one else (including the waiters) have spotted him/her/it.
The guests are not close friends but professional contacts who would have been horrified by any fuss, and particularly, I suspect, by the mouse sighting.