Dusty man

My friend and I were travelling on the train and we were sitting opposite each other and a man was sitting beside my friend. Suddenly the man turn to me and asked:
- Do I have dust in my face?

I was surprised by his unusual question and he was indeed covered in fine dust. He wiped his face and started to tell us why he was covered in dust. I have been up high blasting (Swedish blästra) a multistory building and I am returning home.    

Well there is nothing really remarkable about this but it was such a weird question to ask a totally stranger and of course it had to be me. Then again I have been offered raw fish to eat by a fellow passenger so I should not be surprised anymore....