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My friend and I were wearing our Ironette costumes (from Iron Man 2) at SDCC and as we were crossing the street to get to the con center a crazy-looking homeless lady who appeared to be trying to sell pictures of ships (like 4x6 snapshots, I have no idea) called us disgusting ladies as she was ranting incoherently. We had a good laugh over that one.
Other than that, just the usual inappropriate comments and whistles, but if you're going to be parading around in a costume you'd better damn well expect it.