These shouldn't be listened to at work because of the language used, but here are two of the best meltdowns I've ever heard.
The first is Cubs manager Lee Elia's 1983 blowup. The Cubs were playing poorly and the fans were unruly, so Elia went crazy.
The second from a pre-game radio show when Baltimore Orioles manager Earl Weaver decided he didn't like submitted fan questions. Weaver was always an angry little man.