You overhear a phrase or an observation that you just know will fit seamlessly into your creative writing – the glass question is: will you remember it by the time you reach your manuscript?
Often the answer is no… Solution: don’t leave home without notepad and pen!
Author Jilly Cooper famously would take pen and paper to all her dinner parties and events, writing down the audible, lord-able gems from her guests’ conversations. Amazingly her guests never took offense, in fact they played up to these occasions, then waited impatiently for her next book in the hope they would recognise themselves amongst her carefully crafted characters.
Take note, guard against the glass question.