The vast majority of coppers are decent guys and gals doing a tough job with no respect or appreciation from us.
When I moved back to Toronto this past summer, I walked by a film crew doing some work over a long weekend, and the cops there would always have a giggle at the t-shirts I'd wear with sayings on them. I ended up buying a stack of $10 Timmies gift certificates and gave one to every copper I passed on the way to work or back to my apartment. They ALWAYS appreciated both the thought and the coffee. Total cost: a few hundred. Smiles received: priceless!