The classic, and my tool of choice for the last few months. Something to set the tone. If in doubt, crowbar it.
This was hiding at the back of the barn. Might need a little sharpening, but the weight alone would carry it through alien scum (or the Marder).
An upgrade to a two-pronged hay fork would give better reach, but you'd need to be accurate.
Four have to be better than two! Skewer those headcrabs! Or muck out horse shit.