There are plenty, but the 1998 semi final against North Sydney is a personal favourite. We had been bundled out in straight semi's the previous year, and everyone was writing us off against a hot Bears side. We were down at half time with Jason Smith concussed, but the second half was amazing. To see Stuart Kelly break through the defence, with Penna following it up next play for a try was great, and those 3-4 tackles in the later part of the game where Dean Pay, Dallas Weston etc were anihilating the bears forwards was incredible - such a rush. We battered the bears to the point where they were knocked-out in straight semi's. At the end, I went to the tunnel to clap the boys off, and Jarrod McKraken winked at our section of the crowd - amazing game, dominant performance, and from memory, Parra's first semi final win since 1986. Still have it on tape and it lives long in the memory.
Honourable mentions:
Parra defeating Great Britain in 1992
Lee Oudenryn scoring 2 tries to defeat NEwcastle, same year
Parra hammering the Wests Tigers in 2001 64-10 (and every other flogging in that wonderful regular season)
Parra beating Manly at Brookvale in 1997.