Day 3 - A card from the first set you tried to complete
I'm going to tweak this one a little bit. Truthfully, I don't remember what the very first set that I tried to complete was, so instead, I'll tell you about the first set of cards that I really got into for my pack buying as a young collector.
Looking back on it now, 1988 was a rough year for cards. It's right at the beginning of the "junk wax" era, the designs were mostly pretty boring, and the rookie class was very slim. The one bright spot for me as a young collector was 1988 Donruss. As an 8-year-old, I loved the design. It had a futuristic look to it, and most importantly to me at the time, the alternating corner designs fit together like a puzzle when you put them in a binder. How cool is that!
Of course, almost 30 years later, I see them for what they are in full context, but the 8-year-old version of me thought these were AMAZING!