Probably the 1983 copper planchet strikes. There's lots of sites that you should definitely consider reading if you want to get into error coins...like coppercoins.com, CONECA, doubleddie.com, etc...
Gamebird, enjoy your learning and aquisition experience quarter-back, I started checking my 82's about 5 years back, the 'copper' hoarders must have taken a big bite from '82-08 cause I find approximately one bronze to eight zinc here in the northeast. I cannot find any information on the proportion of zinc to bronze cents minted in 1982, only the total of about 21 billion minted and individual numbers from the three mints, anyone know of the original percentage?