It's a useful took for pulling out nails, breaking open doors, tearing holes, breaking things, and just about everything else you can do with a metal stick.
It also serves as a nice weapon, the bar is heavier than a baseball bat and the prying ends can create some wounds that a knife can't.
Hey! I need a crowbar to open this door.
Half-Life's most useful weapon is the crowbar.
Some dumbassbroke into my house with a crowbar and tried to use it on me before I shot him.
Absolutely one of the most useful tools to have, it can be used as a weapon on account of being heavier than a bat but still slender enough to not be a fucking club. They range in size, but they universally have two sides: One for prying out nails, and another one for more blunt leverage. The side that pries out nails is incredibly effective as a weapon, being able to inflict cuts that a simple knife cannot match. If you use this properly, you are a chad among chads. It's also great for prying stuff open and ripping stuff off.
No wonder Gordon Freeman kicks ass with it.
Anarchist 1: Hey! You got a crowbar, don't you!
Anarchist 2: Yeah, I ordered mine off the internet.
Anarchist 1: Damn, all I got is a knife I duct taped to a pipe.