Too easy?

One day I was standing in a kiosk when the only assistant was serving some others a meter or so away. Behind me was a freezer box of  ice cream. Suddenly a guy comes behind me, picks an ice cream from the box and wips!  he's gone! I had not even time to shout. Kind of thing that makes one wonder if it really happened. I did not say anything to the assistant. Should I have?

Some macro ice from a small trickle of water, flash was used.