[cowboysauce]

The thing I've always found most interesting about hydrofluoric acid is that it's corrosive and poisonous. Other acids like hydrochloric acid and sulfuric acid are corrosive, but they're not poisonous like hydrofluoric is. Other common acids will burn you, but that's the extent of their damage. Hydrofluoric acid will burn you and absorb into your body, interfering with calcium ions in a way that can lead to death.