When UD Be a Player hockey first came out in the 90's, I spent $10 and bought one pack, knowing the (ex) wife would kill me, as we didn't have much money at the time.
I sat in the car, and ripped it, to enjoy my moment before I went home and faced her wrath.
And I pulled a Gretzky signed card out (which was THE premier chase card of the whole set). I was jumping up and down and ran back into the store to get a top loader, and the guy offered me something like $600 or $700 for it. I declined (Beckett had it at $900 and rising). Which was stupid, because I still have it today, and I think it is worth maybe $75 or $100?
Oh well, it was an awesome moment!