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Surprisingly, the octopus got a lot of different interpretations, best one was:
CHTULHU! (I am so using that :)

The dancer and the bridge also confused a lot of people - seem to both have large variation in depiction.

The eggplant has a VERY specific meaning, is only used in that context in the US.  It's just a plain ol' veggie for the rest of the world.
So, since I am not US based, I did not get any rude suggestions for that one :D