close encounters

1st
a sighting of one or more unidentified flying objects:
flying saucers
odd lights
aerial objects that are not attributable to known human technology

2nd
an observation of a UFO, and associated physical effects from the UFO, including:
heat or radiation
damage to terrain
crop circles
human paralysis (catalepsy)
frightened animals
interference with engines or TV or radio reception.
lost time: a gap in one's memory associated with a UFO encounter

3rd
an observation of what hynek termed "animate beings" observed in association with a UFO sighting. Hynek deliberately chose the somewhat vague term "animate beings" to describe beings associated with UFOs without making any unfounded assumptions regarding the beings' origins or nature. Hynek did not necessarily regard these beings as "extraterrestrials" or "aliens." Additionally, Hynek further expressed discomfort with such reports, but felt a scientific obligation to include them, at the very least because they represented a sizable minority of claimed UFO encounters.
Bloecher subtypes.

The UFO researcher Ted Bloecher proposed seven subtypes for the close encounters of the third kind in the Hynek's scale.
A: an entity is observed only inside the UFO
B: an entity is observed inside and outside the UFO
C: an entity is observed near to a UFO, but not going in or out.
D: an entity is observed. No UFOs are seen by the observer, but UFO activity has been reported in the area at about the same time.
E: an entity is observed. But no UFOs are seen and no UFO activity has been reported in the area at that time
F: no entity or UFOs are observed, but the subject experiences some kind of "intelligent communication"

4th
a human is abducted by a UFO or its occupants. this type was not included in Hynek's original close encounters scale.
Jacques Vallee, Hynek's erstwhile associate, argued that a CE4 should be described as "cases when witnesses experienced a transformation of their sense of reality," so as to also include non-abduction cases where absurd, hallucinatory or dreamlike events are associated with UFO encounters.

5th
named by Steven M. Greer's CSETI group, these purported encounters are joint, bilateral contact events produced through the conscious, voluntary and proactive human-initiated or cooperative communication with extraterrestrial intelligence. this is very similar to some "contactees" of the 1950s who claimed regular communication with benevolent aliens.

6th
on Michael Naisbitt's website, a sixth proposed CE scenario is described as UFO incidents that cause direct injury or death. this category was not included in Hynek's scale, and is furthermore redundant: a CE2 in Hynek's scale specifically included UFO encounters that leave direct physical evidence of any kind.

7th
The Black Vault Encyclopedia Project proposes a Close Encounter of the Seventh Kind as human-alien hybridisation. this concept similar to ideas promoted by ancient astronauts theorists like Erich von Däniken, Zecharia Sitchin and Robert K.G. Temple, in that extraterrestrials interacted with and influenced ancient human beings in the past. a Close Encounter of the Ninth Kind is termed Revelation. for a CE9 to take place, an extraterrestrial race would openly reveal themselves to humanity, forever lifting a veil of secrecy in regards to alien involvement in human affairs.
this concept of CE7 is at odds with Hynek's original concepts, however. Hynek's CE3 specifically avoided describing UFO occupants as "aliens" or "extraterrestrials," contending that there was not enough evidence to determine if beings associated with UFOs had an objective physical reality, let alone to confirm their origins or motives.

8th
Captain Mission gave evidence at the SETI secret hearings in nevada 2007 to a senate trilateral secret committee about his experiences and CE8K where he testified sexual intercourse with an alien from andromeda 7 on a regular basis. the results are classified but leaked material indicates that captain mission's evidence is authentic.
yes capatain mission boldly goes where no man has gone before.