Acid

Acid is one of the tools Henry can use in Infiltrating the Airship during the "Government Supported Private Investigator". He attempts to use it to open a hatch on the roof of the Airship, but the wind blows the acid at Henry's legs, which disintegrate causing him to fall off the ship, after desperately trying to get back on, which results in a fail.

Fail Message
I can't stand acid either.

Trivia

 * Though it is unknown what type of Acid it is, it is clearly in its Concentrated form.