Back in the 90's I found an old cardboard box full of radioshack electronics components and a paper schematic of how to put it together. I asked my dad what it was. He had been into an electronics hobby in the 1980s and told me that it was a amplifier to receiving laser light bounced off of a window for spy stuff. I couldn't believe it. The kit became my first significant soldering project. I got it all together and put my beloved laser pointer on a tripod and tried bouncing it in. I never did get it to the point that I could hear voices but boy could I ever hear cool vibration noises when I tapped the window.

It was extremely fun and I've been soldering things here and there ever since.