LOL BFG. This is what I was talking about when I said, you don't necessarily have to be angry, to show that you are angry. Your post is the perfect example.
Sometimes, if has proved beneficial for me to show anger. For example, the rep sold me a bad thing. I take it back for exchange or refund and the rep disagrees/denies. The more you show you are in good mood, the more it would be difficult for you to get what you want. So a little pissy behaviour here, does me the trick.