I'm too young for 87 prelim, so it's the 2004 Elimination final v Essendon for me. It had come off such a deflating 4 weeks after we were 1st after Round 18. I was sitting near the goals when Phil Read missed in the dying minutes to tie the match.
It wasn't just the margin but the talent we had in the team at the time (White, Neitz, Yze, Johnstone, Davey, Green Etc). Competing and beating the best but also prone to some bewildering losses to lower ranked teams.
2004 was a missed chance for the Demons in so many ways. It was also the last game we got to see Troy Broadbridge play, which in retrospect adds another layer of heartbreak.