When packing holiday leftovers to send home with guests, put their car keys in the fridge with the leftovers. They will think you are nuts, but they won't get any farther than the car door without their keys - and the leftovers!
I've also done this when I've called up to visit my parents right after shopping, and wanted to put some chilled purchases in their fridge while I talk to them.
I was a bit worried about actually putting the keys in the fridge, in case they wouldn't work if they got too cold, but you can put them anywhere, e.g. on a shelf in the kitchen, as the fact of having to retrieve them will remind you of the food in the fridge.
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