I'm not saying you're wrong that it evolved as a defense mechanism, I just wonder why it's the only flavor that causes the reaction. Spicyness can cause a fair amount of distress, although you aren't likely to die from a chipotle.

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I was just sitting here contemplating the immortal words of Socrates who said, "I drank what?"

"Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot." --Carl Sagan "Pale Blue Dot"