I put a chewing gum near the girl sitting next to me on the train. She was wearing have winter boots with thick heel. Before i started to shoot she put her heel right on the chewing gum and started to rocke her shoe over it. She did not even locked what was unter her shoe, she either did not noticed or she did not care. She was smashing the chewing gum with all her, she played with her shoes and returned back to trample the chewing gum, I think she did like the feeling of rocking her shoe over something at least it looked that way. Very nice real candid shoot.