Ok I'll start.
One of the best and most credible cases of a UFO sighting is the 1976 Tehran UFO incident.
At approximately 0030 hours local time (2100Z), 19 September 1976, the Imperial Iranian Air Force command post at Tehran received four reports by telephone, from civilians in the Shemiran city district, of unusual activity in the night sky. The callers reported seeing an object similar to a star, but much brighter...At 0140 hours, a ...F-4 was scrambled, piloted by Lieutenant Parviz Jafari and Lieutenant Jalal Damirian. Jafari would eventually retire as a general and participate on 12 November 2007, at a National Press Club conference demanding a worldwide investigation into UFO phenomena...While the object and the F-4 continued on a southerly path, a smaller second object detached itself from the first and advanced on the F-4 at high speed. Lieutenant Jafari, thinking he was under attack, tried to launch an AIM-9 sidewinder missile, but he suddenly lost all instrumentation, including weapons control, and all communication. He later stated he attempted to eject, but to no avail, as this system, which is entirely mechanical, also malfunctioned.
..the Defence Intelligence Agency ...assessed the quality of the report. The form indicated in checked boxes that the content was of high value, that the report was confirmed by other sources, and that the utility of the information was potentially useful to them. The form from the DIA also stated the following:
"An outstanding report. This case is a classic which meets all the criteria necessary for a valid study of the UFO phenomenon:
a) The object was seen by multiple witnesses from different locations (i.e., Shamiran, Mehrabad, and the dry lake bed) and viewpoints (both airborne and from the ground).
b) The credibility of many of the witnesses was high (an Air Force general, qualified aircrews, and experienced tower operators).
c) Visual sightings were confirmed by radar.
d) Similar electromagnetic effects (EME) were reported by three separate aircraft.
e) There were physiological effects on some crew members (i.e., loss of night vision due to the brightness of the object).
f) An inordinate amount of maneuverability was displayed by the UFOs."
They're here...
...and we're doomed... DOOOOOOOOOOOOOOOOOOOOOOOOOMED!