WTF moment

So,

I'm on the train this morning headed to work, and this older white-haired lady is staring at me either  like she had never seen ablack man before or she was afraid I might beat her up.  I don't know what kind of look I had on my face (though most people say I always look pissed off until I smile), but the young man who was sitting with her smiled at me and said :

"Sorry for the stares, sir. This is my grandmother's first time outside of Finland. She's only seen black people for the first time this morning when I picked her up at the airport."