I have a lot from when I was collecting - which unfortunately, was when the flood of product was out on the market ('90 - '91, mostly). I remember my mother giving me $2 for lunch every day, but spending it every morning on a couple packs of Topps. Gotta love that old Topps gum; not terrible the first week that the new cards came out, but taking on the consistency of a pile of dust-covered glass shards by the end of the year.
I remember it being a big deal that my mother would let me hang out downtown when I was in junior high (we lived a few miles out of town, so she'd have to make a special trip to pick me up). We'd hang out at the card/comic store for hours.
I remember stealing my brother's best cards, trading some, keeping some, until he caught me. Must have knocked the crap out of me, because I don't really remember how we resolved that.
My "best" card is a Rickie Henderson rookie card that's in such bad shape I bought it for $10 when the Becket guide listed its mint value at $80.
Even then, though, I loved collecting old cards. There's something about a bunch of baseball cards - even of complete, absolute nobodies - from the 1950s or 1960s that reminds you of how timeless baseball really is.
I think my favorite card of all time is my NY Mets Choo Choo Coleman that informed me, on the back, that he does in fact love choo-choo trains.
I've gone through some of my worthless cards, picked out a couple dozen duplicates, and given them to my daughter, just hoping that it'll stick. Not that I want her to forgoe lunch, but just because...