Tough one this, there's alot too choose from.
One which springs too mind is, Sheffield Wednesday at Hillsbrough in the Premiership, not 100% sure of the season. We won 5-2, it was a night match, the Leppings Lane end was packed with Derby fans who were going mad, it was my 1st away game, and it was just awesome, back in the days when Baiano, Eranio and Wanchope were ripping defences apart...not sure if Asanovic was still with us.
Last Season's 3-0 win over Forest at Pride Park has too be up there, so far the only time I've been in the ground too see us beat the Scummers. And there's nothing better than thrashing the enemy. Tommy Smith's first goal was one of the best bits of football I have seen, from him Bisgaard and Idiakez, Forest couldn't get near the ball, Rasiak got 2 poachers goals as well to seal the win.
Last Season 2-1 win at the JJB against Wigan was another, it's Boxing Day, we're 1-0 down to what some people say is the best team in the league, at their ground where they never lose, it's half time and the mood among Derby fans isn't great, but Christmas is the time for miracles, and after Rasiak pulls a goal back, Tommy Smith comes off the bench to head in a Bisgaard cross to take the 3 points. We were all bouncing up and down singing 'jingle bells jingle bells jingle all the way oh what fun it is too see the Derby win away' nearly none stop for about 20 mins after that it was great.
The Fa Cup replay at Craven Cottage v Fulham last season was great, despirte losing 4-2 after extra time, we outplayed Fulham and injuries to key players before and during the game (mainly Tommy Smith who ripped them apart in the 1st half) saw us fade away and miss out, but still 4 0r 5 thousand Derby kept on singing, the atmosphere was amazing, even Chris Coleman was complaining on Match of the Day that Fulham fans don't make enough noise and all you could here all game was screaming Derby fans even when it was 4-2
And last but not least Leicester at Pride Park, 2002/03 season, it is a local derby, not the big one, but seems as they usually beat us, we hate them, we;re 1-0 down it's the 88th minute a lot of people are heading for the exit, and the ball bounces in front of Craig Burley on the edge of the box, he just smacks it, it flies in and the roof comes off Pride Park.
Honestly, my chair didn't flip back up like it it was supposed too, so I was stood on it and jumping up and down, waving my thists in the air, giving the Leicester fans the middle finger and everything, I was stood on that chair untill I went too leave, and about 7 or 8 minutes the atmosphere in Pride Park was unbelieveable, I've never heard anything like it, it had been a frustrating season, we had been taking stick of the Leicester fans all game, it looked like we had lost too them again, then all of a sudden we score a goal, and it seemed that a lot of anger and frustration and stress was coming out of the fans, because people were just going mad, people don't normally go over board with their celebrations were jumping on me and hugging me, it was incredible.
Which ONE is my favourite I don't know, I think I will sleep on it, and post that in the morning.