At my job, we needed to install a new air dryer for the shop air system. I got to design the piping and cut, assemble, and solder the copper pipe. Remember that Waterworks game we had as kids? It was like that, but with real pipes, and fire and stuff. I learned how to sweat solder.
This is the final product.
My boss made me pose like an idiot.
The soldering is a little messy, but it's holding together so far.