Good ol' Tim's (Tim Horton's) seems a little aggressive to it's employees. There are two fairly public cases in recent history. The older happened nine years ago when a worker named Charlene Walsh was caught on a security camera stealing two dollars from the cash register. She was fired.
However, the camera did not catch her stealing. It apparently only caught her removing two dollars from the till. The two dollars was a tip. Think 8 customers give 25 cents so you change them for $2, or a single customer gives a fiver for a three dollar order.