UFOs, etc.

Blues, eye-witness testimony isn't strong evidence for single events, even when the witnesses are people you'd expect to be good observers, like jet pilots and police officers. Lawyers love accident cases where they can have a choice among various credible eyewitnesses.

Photographs of UFOs would be nice, but it's hard to find examples that will convince skeptics (though easy to find photos that believers believe). And how do the UFOs know to keep out of range of the thousands of all-sky surv...