Glass ketchup bottles are still a fixture at diners and restaurants across the country.
You might even be one of those people who goes out of their way to buy a glass bottle over the squeeze bottles.
For anyone who has ever used a glass ketchup bottle from Heinz, you've probably noticed the raised "57" etched on the glass.
While it would appear that the 57 is simply there for decoration, it's actually to show you where to hit the bottle to get the ketchup out. No more struggling!