From The Agony of Victory top 10...
7. Denny Hocking -- In a celebratory dogpile after the Twins won the 2002 ALDS, a teammate put a spike through one of Hocking's fingernails, knocking him out of the ALCS. That's far from the only injury sustained in a baseball dogpile. Giants pitcher Dave Dravecky broke his arm in the pile-up after the team beat the Cubs to win the 1989 pennant, and a number of college players including Florida State pitcher Blair Varnes ('99) and LSU's Lane Mestepey ('04) have been hurt as well.