I wont include any of the Super Bowl season ones. But for me a few of the good:

1983 Lansford FG to beat New Orleans and make the playoffs. I was in 7th grade. Will always remember that vividly.

1985 20-0 divisional win vs Dallas. Everyone knew the Bears were winning the Super Bowl that year as early as November. So losing to the Bears was not a big letdown. Beating the Cowboys like that the week before was great...

Bad:
2003- losing to Detroit in the season finale to blow home field advantage in the NFC.

Mix of highs and lows:
1986 vs Patriots. Jim Everett comes in mid game and sets the world on fire with 3 TDs. We finally had a real NFL QB again... but Patriots win the game on a Hail Mary as time expires....