My brother sent me a very cool set of baseball cards he bought on Ebay that were a variation of Topps cards from the 1988 pack (1987 season) marketed solely in Europe. They are pretty similar to the normal cards from that year but each has a rule of baseball explained on the back. The pack is 88 cards. I went through it tonight and figured out that in that there are 21 future Hall-of-Famers who were active that year, plus Bonds, McGwire, and Clemens. That seems like an insane # of HOFers all active at once.