Rick Pitino gave a famous speech when he was with the Celtics
From Wiki:
Pitino's NBA coaching experience often demonstrated a deep frustration with the dynamics of the league, especially in Boston, where he amassed a 102-146 record from 1997 to 2001. After being beaten by the Toronto Raptors on March 1, 2000 on a buzzer-beater by Vince Carter, Pitino's frustration reached critical mass as he addressed the press. Referring to the expectations of Boston Celtics fans and media, Pitino challenged each of them to let go of the past and focus on the future:
" Larry Bird is not walking through that door, fans. Kevin McHale is not walking through that door, and Robert Parish is not walking through that door. And if you expect them to walk through that door, they're going to be gray and old. What we are is young, exciting, hard-working, and we're going to improve. People don't realize that, and as soon as they realize those three guys are not coming through that door, the better this town will be for all of us because there are young guys in that (locker) room playing their asses off. I wish we had $90 million under the salary cap. I wish we could buy the world. We can't; the only thing we can do is work hard, and all the negativity that's in this town sucks. I've been around when Jim Rice was booed. I've been around when (Carl) Yastrzemski was booed. And it stinks. It makes the greatest town, greatest city in the world, lousy. The only thing that will turn this around is being upbeat and positive like we are in that locker room... and if you think I'm going to succumb to negativity, you're wrong. You've got the wrong guy leading this team.
Pitino's remarks became a cornerstone of Boston Celtics lore, and has served as a metaphor for other sports franchises and their inability to relive past successes. Pitino himself reprised the speech in a tongue-in-cheek manner at Louisville in November 2005, challenging his freshmen players to play as tough as past seniors and drawing laughter from sportswriters in a post-game press conference.