I feel like I really accomplished something today. I actually re-implemented some of the core features of SpamAssassin and made it about 8 times faster. BUT that's not what I'm proud of.
I managed to accidentally wrench off a tap in my garage a couple of weeks ago, and so I had to re-plumb it back on. But being right up against a drywall it was a bit more complex - a case of cut the pipe, clean the pipe, put on new tap, solder it on, solder on half a joint on the other end, and finally solder the two pieces of pipe back together at the joint end.
Yes it leaked first time. But I realised my screw up - I had soldered it back together with the tap closed, so the air/steam pressure build-up blew the solder out of the join. It doesn't tell you not to do that in any of the instructions, but at least I felt like I learned something. And with plumbing, you learn FAST or you get wet.
So now I can add "basic plumbing" to my resumé. Sweet.