Hey Verne! We got one! Sorta!
For our next, increasingly late, freetext, let's take a crack at a good ol' staple of the adventure genre: Acid. Just think where we'd be without the stuff. No Melf's Acid Arrows. No pools of acid in Metroid. No acid-sprayer guns. No acid rain, or acid-scarred faces. Truly, it would be a sadder, more basic world, if probably a safer one for fictional characters.