I have quite a few moments on my mind:
Jan Ullrich winning "Le Tour"
Michael Groß winning all his swimming titles (anyone remember the man at the mic screaming "Flieg, Albatros, Flieg!"?)
World Cup Final 1990
Frank Busemann winning Decathlon silver at 1996 Olympics
German ski jumping team winning gold in 1994 and 2002 Olympics
last year's Biathlon world championships, men's relay, awesome!!!
me winning 200m Dolphin for my school in regional swimming championships in 1993 & 94 ( just my great personal moment
and of course, Boris Becker's first Wimbledon title in 1985, that's when I wanted to learn tennis myself