The only thing that I can imagine it symbolizing (besides indicating a secret area) is the worker Muds empty brew bottles that they get for free as pay.
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..I managed to take out the tiger with a can of mace; but the shop owner and his son, that's a different story all together...I had to beat them to death with their own shoes...
http://www.youtube.com/watch?v=8wRSHXhJzsY
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