Sometimes its the dumbest things in life that make you feel accomplished.

I think the dumbest thing I've done in recent memory because of 'why not' reasons, was getting the combine soldier in HL2 to fire the RPG. This was actually my second attempt after trying it about 7 years ago and I'm still not sure if I actually had to do the following.

You may think this is easy but there were a couple of issues:
1) Valve ****ed up the SDK
2) The combine source code was missing the RPG and animations (don't know if the latter was an actual cause, just a hunch based on observation in game)

The first part I managed to find solutions to over the course of two days, I should had stopped on the first day. It involved using third party tools and installing an older versions of Visual Studios.

The second part was two stages.

The source code was an easy enough attempt, just adding the RPG to the 'include' section and maybe copying/pasting some code from the citizens.

The model was more tedious, yet somehow felt easier than getting the source SDK to work.

At first I thought I would need to use something like blender to add the animations after de-compiling the model, but as it turned out, the animations for models are separate already and linked by a text file, so I just had to copy and paste the animations/text from a citizen model. The tedious part was that the models are different so I had to go through them step by step, removing the offending lines (IIRC the citizens had extra fingers).

To add stupid to stupid, I used the 'compile and error' method to find out the problems.

However, somehow it felt satisfying when I loaded up a simple map and saw the combine soldier fire an RPG at me.

I know exactly how you feel when you succeed at these things. Nice job!