I think all 4 would have caused the board to shut down with the 'server too busy' page popping up, but I'd have to say Hagler-Leonard, because that was just such a mega fight that had been anticipated basically for the entire 80s. Just think of all the hoopla leading up to DLH-Mayweather, now multiply that by 15, and that's what Leonard-Hagler was. That decision would have just been the icing on the cake of a time bomb of arguments for days on end.