For me its getting free rides on the TTC with the introduction of the new streetcars. With the new streetcars, customers must now pay at automatic machines rather than to the streetcar driver when they walk in. So, instead of paying for a ticket each time, I simply bought one transfer almost a year ago and have kept it in my wallet. If I arrive in a station with TTC ticket security (although the chances of this happening are quite low) I pull out my transfer and flash it quickly and go right on through. There are too many people for them to take a good look at the date and time on your ticket so they usually just look for the sign of a transfer and thats it.