Authors:

If there was one thing life had taught her it was that there are times when you do not go back for your bag and times when you do. It had yet to teach her to distinguish between the two types of occasion.

Douglas Adams (2017). “The Hitchhiker's Guide to the Galaxy Omnibus: A Trilogy in Four Parts”, p.576, Pan Macmillan
If there was one thing life had taught her it was that there are times when you do not go back for your bag and times when you do. It had yet to teach her to distinguish between the two types of occasion.