Does Your Cat Know When You're Sick?

Have you noticed that your cat (or dog if you don't have a cat) is very good with tuning into your emotions? I've noticed this basically since we got our cat and that was 9 years ago. She just seems to know when someone in the family isn't feeling well and she comes to sit with the sick person and is always close-by.

Is there anything else that your cat seems to uncannily pick up on besides those times when someone in the family isn't feeling well? Maybe when there's excitement about a birthday or upcoming trip? A holiday?

I truly believe that our feline baby is picking up on a lot more than I ever realized. Anyone else?