There are ample videos on this phenomenon, like this one. Since 65% of Americans identify as Christian, it's reasonable to assume some of the subjects are Christian.
This phenomenon is not unique to Christianity. The oldest written record of such behavior is in the Egyptian Ebers Papyrus, as part of Ancient Egyptian healing techniques, dating to 1550 BCE. Another Egyptian papyrus (Pap. A. Nr. 65) from around the 3rd century C.E. describes the laying of hands on the patient, hand passes, and eye-fixation.
Practically all ancient cultures, including the Sumerian, Persian, Chinese, Indian, Egyptian, Greek, and Roman, used self-suggestion or hypnosis in some form. In Egypt and Greece, the sick often went to healing places known as sleep temples or dream temples to be cured. In ancient India, the Sanskrit book known as The Law of Manu described the techniques used in great detail.
For many centuries, especially during the Middle Ages, kings and princes were believed to have the power of healing through the “Royal Touch.” This was attributed to divine powers. Before hypnosis was well understood, the terms “magnetism” and “mesmerism” were used to describe these phenomena.
The "Toronto Blessing" has been investigated by Andrew Newton, who had this to say about it:
the phenomena so closely resembled mass hysteria that most observers –
scientists and laymen alike – deduced that it was indeed a text book
case of mass hysteria. Those who took part in it were all emotionally
very suggestible and there is no doubt that expectancy and wish
fulfillment played a major part in the experience.
He then examines the testimonial of two of the participants. The first is a man called Mick Brown. He went to Toronto and attended a meeting led by John Arnott, pastor of the Toronto Airport Vineyard. Here is Mick Brown’s testimony:
“A body came falling towards me. I rested it on the ground and moved
on. I found myself beside John Arnott, who was moving through the
crowd, blessing people, who fell like ninepins. I didn’t even see his
hand coming as it arched through the air and touched me gently –
hardly at all – on the forehead. “And bless this one, Lord….” I could
feel a palpable shock running through me, then I was falling
backwards, as if my legs had been kicked away from underneath me. I
hit the floor – I swear this is the truth – laughing like a drain.”
Newton's analysis:
The interesting thing about that testimony is that Mick Brown is not a
Christian. He is an unconverted Daily Telegraph journalist who went to
Toronto to write a report on the Toronto Blessing for the Daily
Telegraph magazine, from which the above quotation is taken. Yet when
Pastor Arnott touched him, Mick Brown experiences exactly the same
phenomena as all the professing believers. He becomes “slain in the
Spirit” and laughs hysterically. Later he told a Christian newspaper
that his experience had made no difference to his unbelief in
Christianity. He was and still is a non-believer. So we are left with
the same physical and emotional experience, the same Toronto Blessing,
the same hysterical reaction but without the religiosity.
This forces us to ask two very important and searching questions:
First, how can this be the Holy Spirit at work? and second, does the
Holy Spirit bestow the same emotional and physical experience on
believer and non-believer alike – ‘slaying in the Spirit,’
uncontrollable laughter, a state of euphoria?
If these things had no spiritual or religious meaning or significance
in the life of atheist Mick Brown, how can precisely the same things
have any authentic spiritual meaning or significance in the lives of
professing Christians? Clearly we are dealing with an experience that
is not truly spiritual in nature, but can be happily shared by
believers and non-believers alike. Obviously it must be up to the
individual to interpret the associated emotions and find meaning… or
not.
Another obvious question is, what is the power that John Arnott has to
induce this experience in a non-Christian who has absolutely no belief
that the Toronto Blessing is a work of God, since he does not even
believe in God? Is it possible that this is nothing more that
hypnotism working on a suggestible mind? Mick Brown had not
participated in any of the warm-up techniques of the worship, and had
no expectation that anything would happen to him. Yet when John Arnott
touched him, quite by accident, down he goes, gibbering away and
laughing hysterically. This seems to point us in the direction of John
Arnott and others like him actually possessing or at least channeling
some kind of supernatural power. Or not…
Stage hypnosis employs the same mental sleight of hand, as do the
industrial scale antics of American TV evangelists, such as the market
leader, Benny Hinn. Once a participant has seen other volunteers
collapsing and falling into what appears to be a trance-like state,
that participant also becomes suggestible. This happens quite
unconsciously and is as reliable as clockwork. One does not have to
take part in the warm up tests and exercises to be affected by it –
merely watching it work with others is enough to increase
suggestibility.
The second testimony is that of Glenda Waddell, a member of staff at Holy Trinity Brompton, the Anglican church in London which acts as the British headquarters of the Toronto Blessing. Here is Ms. Waddell’s testimony of how she first received the Toronto Blessing:
“To my absolute horror I just knew beyond any shadow of doubt my hands
were doing strange things and I was going to roar. I said, “Oh Lord,
I’d do anything but please, please, don’t make me roar. Only the men
roar and the women don’t roar.” But it came and I did roar quite
loudly and I made a lot of awful noise and I was crawling around the
floor doing terrible things and half of me was thinking, ‘This cannot
be me.’ But another part of me knew that it was.”
Newton's analysis:
The disturbing thing about Ms Waddell’s testimony is that it presents
us with a picture of the Holy Spirit supposedly at work. And yet her
experience makes it painfully obvious it was not the Holy Spirit at
work.
By her own account, Ms Waddell was invaded and possessed by a power
which reduced her to bestial behavior, crawling around and roaring
like a wild animal – all against her conscious will. She was simply
taken over, physically and spiritually, by a controlling force. That
is not how the Holy Spirit operates in a believer’s life. He does not
sanctify individuals by possessing them like a demon and forcing them
to do weird, sub-human things. He is supposed to work through the Word
of God, bringing truth to bear upon our minds, enlightening our
understanding. Anyone with any spiritual discernment must see that
this darker force was not the Holy Spirit.
An important thing to understand about mass hysteria is that it can
creep up even on those who are on their guard against it. From the
accounts of the two people in the extract above, it seems to me this
is what happened.