Talk with a co-worker who has a bit of a motivational problem.

Him: if I had more fun, I would be more productive.
Me: you're not here for fun, that's why they pay us.
Him: how are you motivated?
Me: by money.

...

A bit later.

Him: do you plan for retirement some day?
Me: no. By then, there won't be retirement anymore. We will eat fried rats in the street.

He starts understanding why I'm wearing black metal shirts.