My cat threw up some reddish-orange stuff. What do I do?

My cat quickly ate some wet food that I give him as a special treat some times. Then he started meowing like crazy. I didn't think much of it, and we started playing. Then he did a deep meow and I saw him throw up. Now he is resting in his bed. Should I be worried? I've seen him throw up hairballs, but nothing that looked so much like food before.