It takes patience and years of dedication to produce enough content for a book on grocery cart identification or abandoned grocery lists. It hadn’t occurred to me how much until I found out that people have actually done it.  Although I’m a bit miffed that there is no Western Guide to Stray Shopping Carts and I’m resolving right now to make sure I don’t accidentally leave my shopping list behind – I don’t think it’s all that bizarre but…
The Stray Shopping Carts of Eastern North America: A Guide to Field Identification

Milk Eggs Vodka: Grocery Lists Lost and Found