I'm telling you guys, when you reach the register ASK the cashier if their machine is working(even if you know it is) When they say yes say good, I am expecting a $5 coupon!
This will keep them from even attempting that crap
I agree about asking if the cat/coupon machine is working. This will also save you a lot of time. Of course, I get a look like they are dealing with a CRAZY lady.