When was the last time a stranger yelled at you?

I went to the asian market to stock up on some objects. This place is 40 minutes away so I make the trip worth the while when I go. There is a little cafe inside so I decided to get some lunch. I find a table that wasn't occupied except for a napkin and gloves sitting on top. I thought it was trash so I cleaned it off. My mistake because a few minutes later a little old chinese woman starts yelling at me over taking her spot she was saving. I apologized and said I thought it was trash. I just ended up getting my lunch to go.

Would you have thought it to be trash too?