(Very OT) Victory over Caffeine

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I switched to caffeine free coke, and I tasted no difference.

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I taste a difference if I drink it from a gold can instead of a red one. My brain knows there is no caffeine and tells me it's disgusting. It doesn't taste as bad if I pour it in a glass first. It tastes exactly the same if someone else pours it in the glass first but doesn't tell me about it.