This has to be one of the more humorous examples I've seen in a while. The anonymous submitter discovered it while trying to find the source of a rather peculiar bug. Apparently, the exception information wasn't providing enough information about the source of the error. I can't say I'm too surprised ...

try {
 datReadr = dataCmd.ExecuteReader();
} catch (Exception e) {
 if (e.GetType().Equals(typeof(DataNotFoundException))) {
  try {
   throw e;
  } catch (Exception e2) {
   log.error(e2);
   throw new ManagedException(e.GetType().Name);
  }
 } else {
  throw new DataNotFoundException("Exception while importing operational data.");
 }
}