At my old job, you had to be checked by the company nurse if you needed to go home sick. I told my boss I was sick, he said, "Well go to the company nurse and get checked, but I'm sure it's nothing" as pieces of infected lung tissue exploded out of my chest (not really, but it was a close thing). This was in the middle of last year's flu scare. The company nurse, upon hearing my cough and checking my temperature, freaked out completely and sent me home with a note to my boss that I was not to return until my doc had certified that I didn't have Swine Flu or SARS or whatever.
My new boss, upon observing me sniffle quietly over the bottle of Dayquil on my desk, told me, "Hey, you should take care of yourself--you can go home if you're sick, I won't take it out of your personal time or anything." I (heart) my new job.