I just sit at my desk and try to pass the time being ruder to rude customers.
Funnily enough today I was on the phone to a particularly rude bastard who I call Mother of Bowling Ball. He didn't recognise my voice and started screaming about how our customer service was crap and how he'd come down to the call centre and bust our skulls. I politely calmed him down and talked him through everything I was going to fix on his account (none of which I did - he's so fucking screwed when his next bill comes in).
At the end of the call he slammed the phone down after making a passing dig about how he'd better not have to call us back. I took out a piece of paper and scribbled down his address. I'll be making a wee visit to him after work just to see if he wants to talk tough then.
Get ready for some kung-fu.