https://www.simplemost.com/toxic-squash-syndrome-facts/ "plants with a high concentration of cucurbitacin are extremely and unpleasantly bitter. If you bite into squash and experience a nasty flavor, spit it out and stop eating. Eating even a few pieces can cause you to become violently ill and endure terrible side effects." "Since cross-pollination is a contributing factor to large concentrations of cucurbitacin, do not eat squash that you are unfamiliar with, either. For instance, if your garden produces “volunteer” zucchini or acorn squash that you did not plant, or you also grow ornamental pumpkins and gourds alongside squash, avoid eating them."