If I get sick, please don't pray for me. Or at the very least, please don't let me know that you are doing so. According to this recent study:

...[R]esearchers found that having people pray for heart bypass surgery patients had no effect on their recovery. In fact, patients who knew they were being prayed for had a slightly higher rate of complications.

Here's a related article, as well as the full academic paper from the American Heart Journal. (Via Cynical-C.)