Instant Regret Peanut Butter from Firebox is easily the hottest spread for sandwiches. Filled with King Naga chilli and a dash of Habanero. the peanut butter ranks 12 million on the Scoville Scale. The makers warn to avoid giving this to a child or elder, and even beg you to not give it to "unsuspecting people without warning, even if you don't like them" as it's that hot.
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