I'm relearning to use some tools that I have forgotten about over the last ten years or so. E.g., I had forgotten how cool gnuplot is until I needed to make an illustration recently. The graph I created is pretty simple, but I didn't use 99% of gnuplot's options. If you've never played with it, I urge you to spend 15 minutes to learn a little about it. You may find yourself looking for excuses to make graphs.
Well, if getting oral sex while President and lying about it isn't an impeachable offense, then I ask you, what is?!