I had a guy call in sick, he sounded awful on the phone, no problem take it easy and rest. So I go to meet a client downtown for lunch, and this prick is romancing some chick two tables down from me. I mean, c'mon, if you call in sick, try to stay out of the public eye...The look on his face when he saw me come in was priceless though, he got out so fast and we never saw him again...He did come in to get his last check. The best part, I get a call from someone two months later after he put my name down for a reference, I mean, how clueless can some people be?
My advice, if you're sick, stay home.
If you want a day off, just try to plan it ahead.
If you're faking it, you better be good but stay out of the public places that you can be seen. Also, try to be sensitive to your co-workers. If you can pick up where you left off, no big deal, but if like the poster you know someone else will be stuck doing your work, then shame on you. I can tell you from personal experience, over 70% of the sick calls I get from my people are fake, but it's part of life and as long as the policy is not abused, I let it slide.