Cheeseburger flavored Spaghetti-O's.
Happened to be in the pantry, think I just grabbed it by accident when grabbing cans of normal Spaghetti-O's, but it was genuinely the most gross tasting thing I've ever had.
I figured it'd probably either just taste like normal Spaghetti-O's, perhaps with a slight odd cheese flavor, or maybe just straight cheeseburger (which isn't what I wanted when I was about to eat it, but sounded acceptable enough), but it didn't taste anything like what I expected.
Although I ate it only once ever, years ago, I recall that it tasted like only one thing, vomit.
I mean that literally, it did taste like literal vomit.
I think I probably ate 2 or 3 bites before putting it down the drain, but I think I'd rather eat actual bugs than something that tastes like vomit.