Angels. Paul has written we may unwittingly be visited by angelic beings . Movies have been involved in a series bringing this visitation experience to light in a dramatic setting. It is both feasible and probable.
http://www.cherrylaneangels.com/angel_visitations.htm
Note the following article as food for thought (link above)

When one takes a look at history; we find that many major religions have been started from an angelic visitation and divine messages. The Jehovah Witnesses, Mormonism, Islam and most other new religions are no exception. The New Age movement receives their “divine” information from what is called “spirit guides” through deep channeling and automatic writing. Many of these groups hold “angel seminars” so one may learn how to make contact with their appropriate angel or spirit guide. Psychics also receive their spiritual guidance by spirits who may be identified as “fallen angels”. One could also say
Christianity was started by a visitation from the angel Gabriel who brought God’s message to Mary, Joseph and other shepherds in the field.
Since the beginning of recorded time, angels have been involved in relaying the spiritual and divine to mankind. They have also been known to bring false information. This depends on which spirit one makes contact with. 42% of Americans believe they have had some type of contact with the deceased, and almost 15% agree that the work of spirit mediums is a legitimate practice. These and other religions have communion with spirits and or angels for creating extra-biblical books. They are given new revelation or new additions applicable to the Bible.

The new age movement claims them as do the major religions as both their point of origin and ongoing revelation. They are with reason as warning and revelatory messages as in the case of Joseph for leaving Nazareth and going to Egypt. "Out of Egypt have I called my son". Spirit mediums is also a practice predicated on the confidence in visitation. The angel Gabriel to Mary is a case in point.Communion with spirits or angels are prevalent in the pseudepigraphic and extra canonical accounts as well.

An angel can say two different and contradictory utterances in two different traditions:

Can the same angel say two different things concerning a single subject and both have validity? Islam for example, claims this has transpired in the Koran. They believe the Koran was dictated verbally by the angel Gabriel (the Holy Spirit) based on heaven’s eternal tablets.
In the Bible, the angel Gabriel announces of the birth of Christ to Mary, and is told he would be called the Son of God (which means having the same nature as God). (Luke.1:35 also in Matthew.1:23) He would be called "Emmanuel", God with us. This is allegedly the same angel that told Muhammad that God does not have a son, and that god is unable to incarnate as a man, which is ultimate blasphemy for a Muslim. This and other info: http://www.threeq.com/pdf/4A.Religionsstartedby.pdf

Apparently the incarnation is a blasphemy in the Islamic tradition from the above statements. God in His entirety cannot incarnate but some unknown, yes I say unknown manifestation, of Him can as the "Son of God". Do we have a precise idea of what this means? Apparently not with accuracy.