The local fast food joint uses pressurized gas for ketchup dispensation – when it works, it’s fast, clean, and makes it easy to get exactly the amount of ketchup desired. When it overworks, you get …. carbonated ketchup.
And, since we’re talking liquified tomato, here’s a spiritual predecessor to ketchup.
Some say it’s a nipple. To me, I see inflated cheeks and something about to be ejected, a la the sauce dispenser in Chicken Run.
http://https://www.youtube.com/watch?v=ZUdew5gMbTg
Roughly 2:00 minutes into this clip.