There seems to be Tim Horton's on every corner in this town.
I discovered that if you bring your own travel mug and ask for a 'refill' they knock 11 cents off the price of a large-size coffee.
The principle is that you are helping Tim Horton's from supplying a paper cup and the customer gets a warm, fuzzy feeling because they aren't sending yet another cup to a landfill site.
I was basking in the glow of my environmentally conscience coffee-break when I noticed that the lady behind the counter was making my coffee in a paper cup first, pouring the contents into my travel mug then tossing the paper cup in the trash.
Now I'm totally disillusioned about their supposed lofty good intentions; but I do save 11 cents per cup!