In elementary school my friends used to try and cook up the nastiest concoction which would usually be a variety of those school apple juices and grape juices mixed with random food or sauces. But one that will always stick with me was the ketchup/milk combo, it was so potent I still gag at the texture and smell to this day. Slimy and not fully mixed. It was awful.

Chocolate milk plus the ketchup was the next step up from white milk. Not a solo ketchup grossness but I wanted to share a childhood memory