Have you ever heard the figure of speech “packed in like sardines

Have you ever heard the figure of speech “packed in like sardines”?
What does it mean?
Can you give an example of its use?
Here is a photograph of an open can of sardines:
http://commons.wikimedia.org/wiki/File:Sardines_in_a_can.jpg
Meaning: This phrase alluding to how tightly sardines are packed in cans is usually applied to
human crowding.
An Example of Correct Use: “I could barely move on the bus because we were packed in like
sardines.”
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