Crowbar

The Crowbar is an item that appears in Escaping the Prison and Stealing the Diamond.

Escaping the Prison
Henry Stickmin drills a hole in the ground and ends up in a bathroom and sees a crowbar on the floor. He uses it to break a manhole on the floor and enters inside it in his attempts to escape prison. This leads him to a vent. When he escapes the vent pipe, he falls right next to two armed prison guards. A furious chase begins.

Stealing the Diamond
Henry enters the Retro Room next to the Tunisian Exhibition, and seeks for a tool that he could use to take the Tunisian Diamond. The Crowbar (but a different one) is one of the items presented in the exhibition. Henry tries to take it, but is killed by a horde of headcrabs falling onto him.

Fail Message
Why does that ALWAYS happen!? (Legacy)

Man, I HATE it when that happens! (Remastered)

Trivia

 * The Crowbar's coloration in StD and headcrabs refer to their appearance in Half-Life, where it is the first obtainable weapon, commonly used by players against headcrabs.
 * Considering how headcrabs from the Half-Life franchise can transform their victims into severely deformed zombies, it is one of the most gruesome fails in the entire series.