A very sheltered friend of mine (white American) often acted like a little kid in her early 20s because she grew up with Christian media as her only entertainment, and youth groups as her only social outlet. One day we were commuting by train and she started singing a kids' rhyme about llamas that ended with "President Obama Llama!". Then suddenly she looked stricken and was very quiet until we got off the train half an hour later.

I ended up asking her if she was okay, and it turns out she saw a black couple a few rows over from us right after finishing her song, and she was terrified that she offended them by "being disrespectful about Obama". I asked her if she meant to be disrespectful about Obama, and she said of course not. I'm not sure that she bought my reassurances that it was very unlikely that that couple gave a damn about a phonics song for elementary schoolers. They probably just wondered why a 23 year old was singing about llamas on a train. A whole other time that we were out, she asked me if I thought she offended a black McDonald's cashier by asking for a vanilla milkshake, and she was 100% serious although at least she believed me when I said "no" that time.

These are some very random memories I just had unearthed by a reference to Obama llamas.