My nephew's a cop. Graduated from the police academy a year ago. He had a good job prior to this but he hated it. Now being a cop, he says he come's home happy. And he said this after describing numerous altercations he's been involved already, from being punched, kicked, spitten on, and two week ago, bitten on the bicep (he proudly showed pictures of the bruised, broken skin).
I told him you are cut out for this kind of work because you love.
I couldn't do this on a daily basis.
JK is talking about the demands of the job here.