Poor Communicating

While I have had plenty of jobs that could serve as great examples of poor communicating from management down to the employees, probably no instance was more costly than a moment from when I played Highschool basketball. Basically what happened was we usually would have weekly practices on Sunday mornings from 4:00 to 8 AM, but through poor communication from the head coach to the assistants the message was distorted a slight bit. Instead of relaying the message that practice would only last until 7 on that specific morning, the assistant coach told ALL of the the players that practice wouldn't START until 7. Needless to say we were ran almost to death for showing up for "practice" 3hrs late. I think the whole situation could've been solved through better communication, both by the speaker and listener.