For the purposes of this thread, let's limit it to home games that you've either attended or watched on TV. I'll mention a few that stick out to me, and feel free to comment on those and mention some others.
1. "Beat LA" - best chant in sports.
2. "New York Knicks" - Game 6 of the second round against the Cavs in 2010 when Boston was in the process of eliminating the Cavs and LeBron's impending decision was a major headline. Hilarious chant.
3. "Wifebeater" - Chanted at Jason Kidd in the '02 and '03 playoffs. It ultimately backfired, as the Nets won both series, but still a great (and justifiable) dig at a rival.
4. "Larry" - Obviously chanted in appreciation for Bird. Thought it was hilarious during a game in the early 90's when a bird flew into the arena, and the crowd did that chant.