When there are lots of teams - and lots of scrums, the scrum-masters get together once a day and have a "Scrum of scrums" where they describe what their teams are doing, how it's going, what the cross-team blockers are, etc.  Similarly, they have scrum-of-scrum planning, scrum-of-scrum sprint retrospectives, etc.  In a giant company, there might even be scrum-of-scrum-of-scrum levels.
 
When there are lots of teams - and lots of scrums, the scrum-masters get together once a day and have a "Scrum of scrums" where they describe what their teams are doing, how it's going, what the cross-team blockers are, etc.  Similarly, they have scrum-of-scrum planning, scrum-of-scrum sprint retrospectives, etc.  In a giant company, there might even be scrum-of-scrum-of-scrum levels.
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== Conclusion - Does It Work? ==
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== Isn't it a little...um...silly? ==