Some folks can down a whole bag of Warheads ... Sour candy is highly acidic, and excess exposure to acid can absolutely burn ...

This is because the acid in sour candy (and especially in ultra-intense sour candy) irritates your tongue ... getting these burns from sour candy, such as Black Death or Warheads.

Of course, these false claims about candy-coated bravery were largely cooked up by the people who just want to see their friends squirm with discomfort as their tongue wages war with a sour treat.