Hey Photoz,
I had the exact story (minus the can) happened to me on the Danforth!
Guy said that the wife and kid were waiting in the car.
He offered me his drivers licence to hold on to for $10 while he went and got them.
Typically, you might say, "No buddy, just go and take care of your family, here's some $"
I decided to look at the license.
The licence had expired 2 years earlier.
I told him he should run.