I was at the game when Griffey hit his first HR as a Red. I believe it was on a Sunday, the Reds 6th game. Cubs had a 6-0 lead in the 6th when Griffey homered, moments later Ochoa homered to cut it to 6-3. The game eventually went to extra innings and the Reds won 8-7.
Dunn is my favorite player, and I've been lucky enough to watch him hit at least 7 home runs in person. The one's that I remember are in August of 2001 vs the Rockies(IIRC, it was his 5th career HR), the 535-foot shot vs Dodgers in August of 2004, 2 HR on Opening Day of 2005, solo shot vs DRays last year on Wily Mo bobblehead night, this year on Opening Day, and again on June 11 vs the Cubs.