When did you get a bill and think "I'm not paying for that?"

Have you ever received a bill and thought "Oh I'm not paying that....."

Brian got the bill from his ER visit on the West Coast from when he stepped on that shell. When he went to the ER in Orlando 3 days later, they told him the first ER did everything wrong which ended up costing him 2 more doctor visits. When he got the bill yesterday he had the "Oh I'm not paying that...." thought. When did you get a bill and think the same thing?? Did you end up having to pay??