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 Mom drug us to one for 5 years when we were kids because the pastor was a family friend, I swear I have hearing loss from the whole thing. Those people were insane, it was like the wildest version of Pentecostals you can find online, and maybe even crazier. Insanely loud, disorienting speakers as well. 
 This book, whether you like Orthodoxy, does a good job taking charismatics to task.

https://www.amazon.com/Orthodoxy-Religion-Future-Seraphim-Rose/dp/188790400X/ 
 He makes some good points but I don't like recommending people EO books. They're guilty of a lot of the same things the Pentecostals are, albeit in a much more reverent form. 
 My Great Grandma was very involved in the charismatic movement, she could sometimes converse in Greek without ever having learned a word, but she couldn't understand Greek.

That's a real case of the phenomenon.

More often than not, the Pentecostals are just screaming gibberish, and it doesn't sound like genuine language, it's always something like "halshamadamanai" way too repetitive to be authentic communication. It's hard to argue that it's intentional deception, though. I think the extreme degree of crowd control, hormones pumping, etc. triggers some kind of euphoria where they just speak nonsense and they don't even realize it's just their brain short circuiting.