That could be something the fridge can suggest, in email+notification+display on the outside [in flashing red]! You're on to something here!

Maybe the slapping hand (that warns you you've opened the fridge enough for the day) can be used to slap the back of the Ketchup bottle as well.

In order to maintain privacy, I'd suggest that the Heinz bottle compare a ketchup image to a hash of over-empty bottles.

The iHeinz can then send a notification to the manufacturer who then passes it to the Ketchup Police.

Maybe the bottle can include a time crystal that could advance the time by an hour so you don't have to wait for gravity.

I'd honestly rather buy ketchup in a refill bag for my plastic bottle than a glass bottle.

The secret is to store the bottle upside down in your fridge.

Also works well on honey bottles

I do this, with plastic bottles. It's a dangerous game with glass bottles and kids opening the fridge.

thank you for your public service. I owe you.

re-vo-lutionary.

genius!